A girl stands 170 m away from a high wall and claps hee hands at a steady rate so that each clap coincides with the echo of the one before a) if she makes 60 claps in 1 minute what value ahould be the speed of sound in air ?
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Answer: 340 m/s
Explanation:
Distance between the girl and the wall is 170 m
She makes 60 claps per min i.e.,
60 claps in 60 seconds ....... [∵ 1 min = 60 sec]
So, frequency of the sound of the clap = 60 / 60 = 1 Hz = 1 per second …. [∵ 1 Hz = 1/second]
Since the sound of the clap will first go to the wall and then reflect back to the girl,
∴ The wavelength of the clap = 2 * 170 m = 340 m
Thus,
The speed of the sound of the clap in the air is,
= frequency * wavelength
= (1/sec) * 340 m
= 340 m/s
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