## Question 18/55 (2 p.) A vibrating object produces ripples on the surface of a liquid. The object completes 20 vibrations every s

Question

Question 18/55 (2 p.)

A vibrating object produces ripples on the surface of a liquid. The object completes 20 vibrations

every second. The spacing of the ripples, from one crest to the next, is 3.0 cm.

What is the speed of the ripples?

D

C 60 cm/s

120 cm/s

A 0.15cm/s

B 6.7 cm/s

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Physics
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2021-07-19T22:56:30+00:00
2021-07-19T22:56:30+00:00 1 Answers
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## Answers ( )

Answer:the correct answer is C v = 60 cm / s

Explanation:The speed of a wave is related to the frequency and the wavelength

v = λ f

They indicate that the object performs 20 oscillations every second, this is the frequency

f = 20 Hz

the wavelength is the distance until the wave repeats, the distance between two consecutive peaks corresponds to the wavelength

λ = 3 cm = 0.03 m

let’s calculate

v = 20 0.03

v = 0.6 m / s

v = 60 cm / s

the correct answer is C