10.6.
A wooden bar vibrating into the water surface in a ripple tank has a frequency
12 Hz. The resulting wave has a wavelength of 3 cm. What is the speed of the wave?
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Answer:
Answer is C.
The relationship between the speed (v) of a wave and its wavelength (λ) and frequency (f) is given as follows.
The equation is speed = wavelength * frequency. That is, v=λ×f
In this case, the frequency is 4 Hz and the wavelength is 20 cm/5 as the distance of 5 crests and 5 troughs are given as 20 cm.
Therefore, v = 4 * 4 = 16 cm/s.
Hence, the speed of the wave is 16 cm/s.
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