ICSE Class 9 Physics Question 12 of 19

Propagation of Sound Waves — Question 8

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Question 8

A boy fires a gun and another boy at a distance hears the sound of fire 2.5 s after seeing the flash. If speed of sound in air is 340 m s-1 , find the distance between the boys.

Answer

Given,

Time (t)= 2.5 s

Speed of sound (V) = 340 m s-1

Distance (d) = ?

V = Distance (d)Time (t)\dfrac{\text{Distance (d)}}{\text {Time (t)}}

Substituting the values, we get,

340=d2.5d=340×2.5d=850 m340 = \dfrac{\text d}{2.5} \\[0.5em] \Rightarrow \text d = 340 \times 2.5 \\[0.5em] \Rightarrow \text d = 850 \text { m} \\[0.5em]

Therefore, the distance between the boys = 850 m.