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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Thông Đạt 3 days 2021-07-19T22:56:30+00:00 1 Answers 1 views 0

Answers ( )

    0
    2021-07-19T22:58:08+00:00

    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

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