Related InterviewSolutions

• A vehicle , with a horn of frequency `n` is moving with a velocity of `30 m//s` in a direction prependicular to the straight line joining the observer and the vehicle . The observer perceives the sound to have a grequency `(n + n_(1))` . If the sound velocity in air is `330 m//s` , thenA. `n_1=10n`B. `n_1=-n`C. `n_1=0.1n`D. `n_1=0`
• A vibrating tuning fork is first held in the hand and then its end is broght in contact with a table. Which of the following statement (s) is are correct in respect of this situation?A. The sound is louder when the tuning fork is held in handB. The sound is louder when the tuning fork is in contact with table.C. The sound dies away sooner when tuning fork is brought in contact with the table.D. The sound remains for a longer duration when turning fork is held in hand.
• A vibrating tuning fork tied to the end of a string 1.988 m long is whirled round a circle. If it makes two revolutions in a second, calculate the ratio of the frequencies of the highest and the lowest notes heard by an observer situated in the plane of the tuning fork. Valocity of sound is 350 m/s.
• Explain: if an observer places his ear to one end of a long iron pipe line, he can distinctly hear two sounds when a man hammers the other end of the pipeline.
• As shown if Fig. a vibrating tuning fork of frequency 512 Hz is moving towards the wall with a speed `2(m)/(s)`. Take speed of sound as `v=340(m)/(s)` and answer the following questions. Q. If the listener, along with the source, is moving towards the wall with the same speed i.e., `2(m)/(s)`, such that the source remains between the listerner and the wall, number of beats heard by the listerner per second will beA. 4B. 8C. 0D. 6
• As shown if Fig. a vibrating tuning fork of frequency 512 Hz is moving towards the wall with a speed `2(m)/(s)`. Take speed of sound as `v=340(m)/(s)` and answer the following questions. Q. If the listerner along with the source is moving towards the wall with the same speed i.e., `2(m)/(s)`, such that he (listener) remains between the source and the wall, number of beats heard by him will beA. 2B. 6C. 8D. 4
• As shown if Fig. a vibrating tuning fork of frequency 512 Hz is moving towards the wall with a speed `2(m)/(s)`. Take speed of sound as `v=340(m)/(s)` and answer the following questions. Q. If the listerner along with the source is moving towards the wall with the same speed i.e., `2(m)/(s)`, such that he (listener) remains between the source and the wall, number of beats heard by him will beA. 2B. 6C. 8D. 4
• As shown if Fig. a vibrating tuning fork of frequency 512 Hz is moving towards the wall with a speed `2(m)/(s)`. Take speed of sound as `v=340(m)/(s)` and answer the following questions. Q. Suppose that a listener is located at rest between the tuning fork and the wall. Number of beats heard by the listener per second will beA. 4B. 3C. 0D. 1
• A small source of sound vibrating frequency 500 Hz is rotated in a circle of radius `(100)/(pi)` cm at a constant angular speed of `5.0` revolutions per second. The speed of sound in air is `330(m)/(s)`. Q. For an observer who is at rest at a great distance from the centre of the circle but nearly in the same plane, the minimum `f_(min)` and the maximum `f_(max)` of the range of values of the apparent frequency heard by him will beA. `f_(min)=455Hz`,`f_(max)=535Hz`B. `f_(min)=484Hz`,`f_(max)=515Hz`C. `f_(min)=484Hz`,`f_(max)=500Hz`D. `f_(min)=500Hz`,`f_(max)=515Hz`
• A source `S` of acoustic wave of the frequency `v_0=1700Hz` and a receiver `R` are located at the same point. At the instant `t=0`, the source start from rest to move away from the receiver with a constant acceleration `omega`. The velocity of sound in air is `v=340(m)/(s)`. If `omega=10(m)/(s^2)` for 10s and then `omega=0` for `tgt10s`, the apparent frequency recorded by the receiver at `t=15s`A. `1700Hz`B. `1313Hz`C. `850Hz`D. `1.23Hz`