Wave Motion 4 Question 17
16. A sound wave of frequency travels horizontally to the right. It is reflected from a large vertical plane surface moving to left with a speed . The speed of sound in medium is
(a) The number of waves striking the surface per second is
(b) The wavelength of reflected wave is
(c) The frequency of the reflected wave is
(d) The number of beats heard by a stationary listener to the left of the reflecting surface is
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Answer:
Correct Answer: 16. (c)
Solution:
- Moving plane is like a moving observer. Therefore, number of waves encountered by moving plane,
Frequency of reflected wave,
Wavelength of reflected wave