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  • An observer moves towards a stationary source of sound with a velocity one. Eight of the velocity of sound. The Percentage change in the apparent frequency is<

An observer moves towards a stationary source of sound with a velocity one. Eight of the velocity of sound. The Percentage change in the apparent frequency is

Option: 1

13.5%


Option: 2

7.5%


Option: 3

0.5%


Option: 4

12.5%


Answers (1)

best_answer

v_0=\frac{v}{8}          v=velocity of sound

s---0

n={n}'(\frac{v-v_0}{v})

\frac{n}{n^{\prime}}=\left(\frac{v+\frac{v}{8}}{v}\right)=\frac{9}{8}
\left(\frac{n-n^{\prime}}{n^{\prime}}\right) \times 100=\left(\frac{n}{n^{\prime}}-1\right) \times 100 \\

=\left(\frac{9}{8}-1\right) \times 100 \\

=\frac{100}{8}

=12.5%

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mansi

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