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Standard XII
Physics
Question

In a ripple tank,15 full ripples are produced in one second. if the distance between a trough and the next crest is 20 c.Calculate velocity of the wave.
  1. 200 cm/s
  2. 400 cm/s
  3. 600 cm/s
  4. 800 cm/s

A
200 cm/s
B
800 cm/s
C
400 cm/s
D
600 cm/s
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Solution
Verified by Toppr

Frequency (f)= number of oscillations / time taken =15/1=15 Hz
The distance between a crest and a trough is equal to half of wavelength (λ).
or 20=λ/2 or λ=40 cm
Velocity of wave, v=fλ=15×40=600cm/s

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