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a wire is vibrated at one end by a device that makes 60 oscillations in 20...

a wire is vibrated at one end by a device that makes 60 oscillations in 20 s. what is the speed of the sound wave in the wire if the wavelengt

25 cm
Science   Advanced-Physics   
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Answer #1

Answer :-

The frequency (f) of a wave is the number of full waveforms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.
Time Period (T) is the number of seconds per waveform or the number of seconds per oscillation. It is clear that frequency and period are reciprocals.

In this case, there are 60 oscillations in 20 seconds.

So, the frequency is, f= 60/20 = 3Hz

Time period, T = 1/3seconds

It means that one wave (wavelength) is taking time 1/3seconds to complete.

So, the speed of sound wave is,

wavelength/time period = [0.25meter/(1/3)seconds]

So, speed of wave = 0.75 m/s. Ans.

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