When a wave moves through 10m, a point changes from crest to trough and the time taken is 1s. The wavelength of the wave and its frequency are:
Correct answer: A. 20m, 0.5 Hz
- A. 20m, 0.5 Hz
- B. 0.5m. 20 Hz
- C. 10m, 1 Hz
- D. 1 m, 10 Hz
Explanation
Time for half wave (crest to trough) T = 1 sTime for 1 wave (crest to crest) T = 2 sf = 1/T = 1/2 = 0.5 HzWavelength (crest to crest) = 2(10) = 20 m
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Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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