Wave Motion 1 Question 2
2. A submarine travelling at is being chased along the line of its velocity by another submarine travelling at sends a sonar signal of to detect and receives a reflected sound of frequency . The value of is close to (Speed of sound in water )
(2019 Main, 12 April I)
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 2. (d)
Solution:
- Given, velocity of submarine
,
and velocity of submarine
or
Signal sent by submarine
Frequency of the signal,
So, in this relative motion, frequency received by submarine
The reflected frequency
So, frequency received at submarine