An observer moves towards a stationary source of sound, with a...

An observer moves towards a stationary source of sound, with a velocity one fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

Options

Azero
B $0.5 \%$
C $5 \%$
D $20 \%$

Correct answer

D. $20 \%$

Step-by-step solution

\frac{v+v / 5}{v}

\frac{6 f}{5}\%

increase in frequency

=20 \%

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