Related InterviewSolutions

• The correct statement among the following isA. sounds with frequency greater than 20 kHz are known as ultra-sonics .B. Dogs can hear ultrasonic sounds .C. In SONAR , ultra-sonics are used .D. All the above
• A man standing at a point on the line joining the feet of two cliffs fires a bullet . If he hears the `1^(st)` echo after 4 seconds and the next after 6 seconds , then what is the distance between the two cliffs ? (Take the velocity of sound in air as `330 m s^(-1)`)
• If wind blows in a direction opposite to the sound propagation , then the velocity of the soundA. increasesB. decreasesC. remains constantD. Cannot be determined
• A source of sound and a listener are moving towards each other . The velocity of the source is `20 m s^(-1)` and that of the observer is `15 m s^(-1)` . If the velocity of sound is 340 m `s^(-1)` and its frequency is 640 Hz, find the apparent frequency of the sound .
• The velocity of sound in a gas is directly proportional to the square root of the temperature of the gas taken in degree celsius .
• A particle executing SHM completes 120`pi` vibrations in one minute . What is the frequency of this motion ?A. 5 HzB. 2`pi` HzC. 1 HzD. None of the above.
• A string vibrating with a fundamental frequency of 8 Hz has tension `T_(1)`. This string vibrates with a fundamental frequency of 15 Hz when the tension is `T_(2)` . Find the fundamental frequency of the string when its tension is `T_(1) + T_(2)` .
• A source of longitudinal waves vibrates 320 times in two seconds. If the velocity of this wave in the air is `240 m s^(-1)` , find the wavelength of the wave .
• An air column enclosed in an open pipe is vibrating in its fundamental mode . The fundamental frequency is 30 Hz. If the velocity of sound air is `300 m s ^(-1)` , find the length of the pipe and frequency of 3rd overtone .
• In simple harmonic motion , the acceleration of the body is inversely proportional to its displacement from the mean position .