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Q.

Speed of sound is recorded as $V_{d}$ on a hot day in Delhi and Shimla $V_{b}$ .. Which of the following is correct?

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a

V_{d} > V_{b}

b

V_{d} < V_{b}

c

V_{d} = V_{b}

d

Can not relate

answer is B.

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Detailed Solution

V_{d} < V_{b}

Speed of the sound increases as the temperature increases. That’s why echo is difficult to hear during a hotter day. By increasing the temperature, particles of the medium vibrate easily. Hence it becomes easy to transfer the vibration energy from one particle to another. So the speed of sound in Delhi will be more than the speed of sound in Shimla since Delhi is hotter than Shimla. So the relation

V_{d} < V_{b}

is valid.

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