In a transverse wave, the distance between a crest and the adjacent trough is 0.25 m and the frequency is 40 Hz. What is the wave speed?
Correct answer A. 20 m/s
Explanation
A crest and its neighbouring trough are half a wavelength apart, so λ = 0.50 m. Then v = fλ = 40 × 0.50 = 20 m/s. Taking λ = 0.25 m gives 10 m/s.
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