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Reflection from an Open End

A car moving ...

Question

A car moving towards a wall at velocity of $10 m / s$ blows a horn of frequency $100 H z$ . Frequency of horn sound that is reflected from wall is [velocity of sound is $340 m / s$ ]

A

98 H z

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B

97 H z

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C

105 H z

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D

103 H z

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Solution

The correct option is D $103 H z$
By,
$f = f_{0} \frac{v}{v - v_{s}} \Rightarrow f = 100 \times \frac{340}{340 - 10}$
$f = \frac{3400}{33} = 103 H z$

$f$ is frequency received by wall and same is frequency reflected.

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