In a ripple tank, 40 waves pass through a certain point in one second. If the wavelength of the waves is 5 cm, then find the speed of the wave:
Correct answer: D. 2 m/s
- A. 2.7 m/s
- B. 3 m/s
- C. 200 m/s
- D. 2 m/s
Explanation
The formula for the speed of a wave is v=fλ Since 40 waves pass through a certain point in one second, the frequency of the wave is 40 Hz. The wavelength of the wave is 5cm, which can also be written as 0.05m. v=0.05 x 40=2m/s
This question appeared on the NUMS 2020 paper, which you can sit online with every answer explained.
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About Wave Speed
Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
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