The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2% of the natural frequency of the source. lf the velocity of sound in air is 300 m/sec, the velocity of the source is (It is given that velocity of source << velocity of sound)

# The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2% of the natural frequency of the source. lf the velocity of sound in air is 300 m/sec, the velocity of the source is (It is given that velocity of source << velocity of sound)

1. A

6 m/sec

2. B

3 m/sec

3. C

1.5 m/sec

4. D

12 m/sec

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### Solution:

When the source approaches the observer

Apparent frequency

=

(Neglecting higher powers because )

When the source recedes the observed apparent frequency

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