InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Fill in the blanks:i. Sound is generated by the rhythmic ……………. of any object.ii. The frequency of sound is measured in …………….. .iii. If …………….. of sound is decreased its loudness also decreases.iv. A medium is necessary for …………… of sound. |
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Answer» i. vibrations ii. Hertz (Hz) iii. intensity iv. generation |
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| 52. |
Match the great musicians:Column AColumn Ba) Bismilla Khan(i) Tabalab) Chittibabu(ii) Shehnaic) Zakir Hussain(iii) VeenaA) a – ii, b – iii, c – i B) a -1, b – ii, c – iii C) a – ii, b – i, c – iiiD) a – iii, b – ii, c – i |
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Answer» A) a – ii, b – iii, c – i |
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| 53. |
When an open organ pipe resonates in its fundamental mode then at the centre of the pipe, (a) the gas molecules undergo vitrations of maximum amplitude (b) the gas molecules are at rest (c) the pressure of the gas is constant (d) the pressure of the gas undergoes maximum variation |
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Answer» Correct Answer is: (b, d) |
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| 54. |
An organ pipe filled with a gas at 27°C resonates at 400 Hz in its fundamental mode. If it is filled with the same gas at 90°C, the resonance frequency will be (a) 420 Hz (b) 440 Hz (c) 484 Hz (d) 512 Hz |
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Answer» Correct Answer s: (b) 440 Hz n ∝ V and V ∝ √T. Here, n1 = 400 Hz T1 = 273 + 27 T2 = 273 + 90 n2/n1 = √((363)/(300)) = √(1.21) = 1.1. |
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| 55. |
Why sound cannot travel through vacuum (or through outer space)? |
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Answer» Because sound needs material medium to transfer energy from on particle to another particle. If there is vacuum, then no energy transfer takes place |
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| 56. |
State whether the following statements are true or false: (a) Sound cannot travel in vacuum. (b) The number of oscillations per second of a vibrating object is called its time period. (c) If the amplitude of vibrations is large, sound is feeble. (d) The lower the frequency of vibration, the higher is the pitch. (e) If the amplitude of vibrations is doubled, the loudness of sound also gets doubled. (f) When the amplitude of vibrations is halved, the loudness of sound becomes one fourth. (g) Unwanted or unpleasant sound is termed as music. (h) Noise pollution may cause partial hearing impairment. |
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Answer» (a) True (b) False (c) False (d) False (e) True (f) False (g) False (h) True |
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| 57. |
Fill in the blanks with suitable words: a) Sound is caused by ……….. b) A sound wave consists of places of higher pressure called ………. and places of ……….. pressure called ……….. c) Wave speed in meters per second equals frequency in ……… multiplied by ……….. in ……….. d) Sound cannot travel through ………… e) The speed of sound in a solid is ……… than the speed of sound in air. f) When the frequency of the sound is increased, the wavelength …….. |
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Answer» a) Vibrations b) Compression, lower, and rarefaction c) Hertz, wavelength, and meters d) Vacuum e) Greater f) Decreases |
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| 58. |
What is vacuum? Explain why sound cannot travel through vacuum? |
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Answer» Vacuum is defined as the empty space in which there are no matter particles present. Sound cannot travel through vacuum as there is no particles present for vibrations to take place. |
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| 59. |
Two students X and Y have to do their experiment on plotting the temperature-time graph for a hot body as it cools to room temperature. They do their experiments in the same lab, using completely identical apparatus, take equal amounts of tap water heated up to the same temperature, start their observations simultaneously and note the temperature values at identically spaced intervals of time. Their temperature-time graphs, plotted on a given graph paper, with the same given choices of scales along the axis, are however, as shown: The following could be the reason for this difference: (A) Use of an overhead fan by student X. (B) Use of an overhead fan by student Y. (C) Less frequent stirring of water by student X. (D) Less frequent stirring of water by student Y. The most likely reason is: A. AB. BC. CD. D |
| Answer» Correct Answer - A | |
| 60. |
For plotting temperature time graph for a hot body as it cools to room temperature, a student is to choose one each from each of the following pairs. A: Calorimeter (i) blackened from outside (ii) polished from outside B: Base for keeping the calorimeter (i) insulated (ii) metallic In order to get the correct graph he should prefer to choose:A. A (i), B(ii)B. A (ii), B(ii)C. A (i), B(i)D. A (ii), B (i) |
| Answer» Correct Answer - C | |
| 61. |
While doing an experiment on plotting the temperaure-time graph of hot water as it cools, we can get a good graph:A. only by noting the temperature of hot water every 30 seconds throughoutB. only by noting the temperature of hot water every 1 minute throughoutC. by noting the temperature of hot water every 1 minute to start with and every 2 minutes later onD. by noting the temperature of hot water every 2 minutes to start with and every 1 minute later on |
| Answer» Correct Answer - C | |
| 62. |
A normal human being can listen to sounds with frequency from …….. to ……. vibrations per sec. |
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Answer» A normal human being can listen to sounds with frequency from 20 to 20000 vibrations per sec. |
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| 63. |
Why do we produce sounds with different pitches or amplitudes while speaking? |
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Answer» The vibration in pitch and amplitude of sound during our speech helps us to communicate with others in form of language. |
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| 64. |
The walls of a hall built for musical concert should:A. amplify sound B. reflect sound C. transmit sound D. absorb sound |
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Answer» The walls of a hall built for musical concert should be able to absorb sound and reduce reverberation. |
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| 65. |
How is sound produced ? |
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Answer» Sound can be produced by following methods : (i) By vibrating string (sitar) (ii) By vibrating air (flute) (iii) By vibrating membrane (table, drum) (iv) By vibrating plates (bicycle bell) (v) By friction in objects (vi) By scratching or scrubbing the objects etc. |
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| 66. |
What longitudinal waves consist of ? |
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Answer» Longitudinal waves consist of compressions and rarefactions. |
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| 67. |
If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be: a) 2 b) 0.2 c) 20 d) 200 |
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Answer» The correct answer is c) 20 |
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| 68. |
Which one of the following does not consist of transverse waves?A. light emitted by a CFLB. TV signals from a satelliteC. ripples on the surface of a pondD. musical notes of an orchestra |
| Answer» Correct Answer - D | |
| 69. |
Which one of the following does not consist of transverse waves? a) light emitted by a CFL b) TV signals from a satellite c) ripples on the surface of a pond d) musical notes of an orchestra |
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Answer» The correct answer is d) musical notes of an orchestra |
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| 70. |
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through: a) water b) waxc) vacuum d) empty vessel |
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Answer» The correct answer is c) vacuum |
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| 71. |
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through …… (a) wax (b) vacuum (c) water (d) empty vessel |
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Answer» (d) empty vessel |
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| 72. |
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through: A. water B. wax C. vacuumD. empty vessel |
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Answer» C. vacuum This note must then be passing through vacuum. |
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| 73. |
Which of the following sound frequencies can be heard by a woman having a normal hearing range? A) 25000 Hz B) 15kHz C) 40000 Hz D) 25Hz A. A and B B. B and C C. B and D D. only D |
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Answer» D) 25Hz 25Hz because the human audible range is 20Hz to 20,000 Hz. |
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| 74. |
‘d’ and ‘λ’ indicates A) wavelength and frequency B) wavelength and amplitude C) amplitude and wavelength D) frequency and amplitude |
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Answer» C) amplitude and wavelength |
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| 75. |
When we change a feeble sound to a loud sound, we increase its: A. frequency B. amplitude C. speed D. timbre |
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Answer» B. amplitude Amplitude. |
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| 76. |
Define the following terms. Give their SI units. i. Period ii. Frequency iii. Velocity |
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Answer» i. Period (T): The time taken by the particle of a medium to complete one vibration is called period of the wave. SI unit: second (s) ii. Frequency (n): The number of vibrations performed by a particle per second is called frequency of a wave. SI unit: hertz (Hz) iii. Velocity (v): The distance covered by a wave per unit time is called the velocity of the wave. SI unit: m/s |
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| 77. |
The speed of highly penetrating ultrasonic waves is: A. lower than those of audible sound waves B. higher than those of audible sound waves C. much higher than those of audible sound waves D. same as those of audible sound waves |
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Answer» D. same as those of audible sound waves The speed of sound waves is same in a particular medium. |
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| 78. |
Observing the changes in sound: Take 4 or 5 metal glass bowls or tumblers. Fill them with water in decreasing order. Strike gently each bowl or tumbler with a spoon.a) What do you hear?b) What difference do you notice in the sound produced?c) Why is there variation in the sound produced due to change in the water level of a bowl? |
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Answer» a) We can hear a musical sound. This is a jalatarang. Fill the bowls or tumblers with equal amounts of water, strike each ball like in above case and listen the sound. b) It does not produce musical note in this case. c) The change is due to change in air columns. That is sounds are produced by the vibrating bodies and air passes through orifices of the instrument. |
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| 79. |
Observing the movements of vocal cords during speech : Ask a friend to raise his neck up. Stretch a chocolate wrapper across his mouth and ask him to blow air on the wrapper forcibly. Observe the changes in movement at his throat. Ask him to blow again slowly and observe the difference in movements. a) What changes do you observe in the movements at the throat on the two occasions?b) Does sound travel only in air?c) Does it travel in any other gaseous medium?d) Does sound also travel in other media like solids and liquids? |
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Answer» a) During the first trial the voice box gets tensed and produces high sound while during the second trial it is close to normal position of throat and produces lower sound. The sound produced in the above activity is due to a combination of vibrations produced in the wrapper and the vocal cord. Propagation of sound: Sound needs a medium to propagate: The sound produced by the school bell will be heard by all of us irrespective of whether we are in a room opposite to the bell or in a room at the back of the bell. Obviously, the sound produced by the school bell travels in all directions and reaches us, propagating through the air present between source of the sound and our ears. That is the air surrounding us act as a medium which allows the sound to pass through it. b) No, it will travel in other media. c) Yes, it will travel in any other gaseous medium. d) Yes, it will travel. |
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| 80. |
Propagation of sound through liquids: Take a bucket fill it with water. Take two stones and strike them against each other keeping your hands inside the water. Ask your friend to listen to the sound by keeping his / her ears touching walls of the bucket.Ask your friend about the difference between sounds produced by striking the stones against each other in water and striking them in air. Thus the conclusion is that sound propagates through matter in all the three states – solid, liquid and gas. a) Does sound travel in liquids?b) Can we hear the sound produced in water? |
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Answer» a) Yes, sound can travel in liquids. b) Yes, we can hear. |
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| 81. |
On which factor does the pitch of a tuning fork depend? |
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Answer» The pitch of the tuning fork depends on the length of the prongs. |
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| 82. |
How does the sound travel? |
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Answer» Sound travels in the form of waves. |
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| 83. |
Two sources A and B vibrate with the same amplitude. They produce sounds of frequencies 1 kHz and 30 kHz respectively. Which of the two waves will have larger power? |
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Answer» Frequency of source A = 1 kHz; Frequency of source B = 30 kHz As the speed of wave increases with frequency and both the waves have same amplitude, the sound produced from source B has larger power. |
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| 84. |
Sitar, veena and guitar are some percussion instruments. |
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Answer» Correct Answer - False Sitar, veena and guitar are stringed instruments. |
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| 85. |
Identify the part which vibrates to produce sound in the following instruments. (a) Dholak (b) Sitar (c) Flute |
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Answer» (a) Diaphragm (stretched membrane) (b) String (c) Air column |
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| 86. |
Observe and discuss:Sitar, Santoor and Mandoline or mandoline (String instruments): |
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Answer» Vibrating strings produce the sound. The greater the tension in the string, the higher is the frequency of the sound. The greater the vibrating length and the diameter of the string, the lower is the frequency of the sound. |
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| 87. |
Assume that the atmosphere is absent on earth, then the velocity of the sound wave in this situation is A) 3 × 108 ms-1B) 331.2 ms-1 C) 3 × 10-8 ms-1 D) doesn’t propagate |
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Answer» D) doesn’t propagate |
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| 88. |
What is noise? Give two examples of sounds which are considered noise. |
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Answer» The Unwanted sound that is unpleasant to ear is called noise. Example 1) Loud music 2) The noise of machines. |
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| 89. |
What is a musical sound ? Give two examples of musical sounds. |
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Answer» A pleasant sound is called music. Its like a treat to the ears. Example 1) Beats 2) Tones |
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| 90. |
What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings. |
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Answer» The harmful and annoying noise to the ears is called noise pollution. The sources of noise pollution are as follows: 1. Televisions running at high volumes. 2. Use of Loudspeakers in religious or other functions. 3. Use of crackers. 4. Horns of buses, cars, and trucks |
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| 91. |
Explain how, noise pollution (or excessive loud noise) is harmful to human beings. |
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Answer» Noise pollution has adverse effects physical as well as mental behavior. The constant exposure to noise pollution can create many health related problems like hypertension, insomnia, mental disorder and may even lead to loss of hearing. |
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| 92. |
List the effects of very loud or continuous noise on the people. |
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Answer» 1. Very loud or continuous noise can cause hearing impairment. 2. This can even lead to deafness. 3. It also causes restlessness, irritability and mental exhaustion. |
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| 93. |
When a metal dish falls on the floor; it makes a loud noise. What do we do to stop the noise? What is the effect of that action? |
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Answer» To stop the noise of metal dish falling on the floor, quickly put hand on the dish. Vibrations of the metal dish are stopped and the noise stops. |
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| 94. |
How do you feel while listening to songs from a radio? |
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Answer» It is very pleasant to hear. |
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| 95. |
When a song is being played on a radio or a music system in the house, place your hand on its speaker. What do you feel? Put off the music. What do you feel now? |
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Answer» 1. When a hand is placed on the speakers of the music system, we feel vibrations on the hand. 2. When music is put off, we don’t feel any vibrations on the hand. |
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| 96. |
A body of mass `10 g` floats with `(3//4)th` of its volume above water. Find its relative density and volume. |
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Answer» If `V` is the volume of the body, then volume of water displaced `= V//4` Since for the body to floats, mass of water displaced is equal to the mass of the body, i.e., `10 g`, `(V//4)rho_w = 10 g` or `V = 40 cm^3` `(as rho_w = 1 g//cm^3)` Density of body, `rho = (10 g)/(40 cm^3) = 0.25 g//cm^3` Relative density of body `= (rho)/(rho_w) = (0.25 g//cm^3)/(1 g//cm^3) = 0.25`. |
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| 97. |
Today our life is richer and fuller of music than it was yesterday, and much of this is due to progress in engineering. What will happen to human feelings when the sea of knowledge spreads further ? |
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Answer» (i) Musical notes will be formed exactly like the human voice by blending pure tones. They will give them a human quality and vital power. Instrumental music will be able to speak, laugh and cry in the direct meaning of these words. (ii) Music synthesizers will obey man and give the composer an unprecedented freedom of creation. (iii) The performing artist will be able to control the new instruments with his eyes and thoughts rather than by his lips or hands, as the violinist, the trumpeter or the pianist does today. He will be both a physicist and a poet and will make a happy union of knowledge and inspiration. |
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| 98. |
Name the characteristic of sound related to its frequency. |
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Answer» Characteristic of sound related to its frequency is PITCH. |
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| 99. |
Name and define the characteristic which enables one to distinguish two sounds of same loudness, but of different frequencies, given by the same instrument. |
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Answer» Pitch is the characteristic of sound which enables us to distinguish different frequencies sound. Pitch is the characteristic of sound by which an acute note can be distinguished from a grave or flat note. |
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| 100. |
Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality? Give a reason for your answer. |
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Answer» Since the guitars are identical, they will have a similar waveform and so the similar quality. |
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