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Class 10 Class 12

Sound

A source of wave produces 40 crests and 40 troughs in 0.4 second. Find the frequency of the wave.

Number of crests and trough produced = 40

Time taken, t = 0.4 second

One wave corresponds to 1 crest and 1 trough.

Hence, 40 waves is equal to 40 crests and 4 troughs.

Therefore,

Frequency of the wave,

ν = \frac{Number of waves}{time taken} = \frac{40}{0.4} = 100 Hz

248 Views

(a) Ocean waves of time period of 10 s have a speed of 15 m/s. What is the wavelength of these waves?

(b) Find the horizontal distance between a wave crest and the adjoining wave trough. You may assume the waves as harmonic.

114 Views

A body is vibrating 6000 times in one minute. If the velocity of sound in air is 360 m/s, find
(i) frequency of vibration in Hz, and
(ii) wavelength of the wave produced.

911 Views

A source is producing 15 waves in 3 seconds. The distance between a crest and a trough is 10 cm. Find (i) the frequency, (ii) the wavelength, and (iii) the velocity of the wave.