The frequency of a wave is 60 Hz. How long does it take to pass 20 complete waves from a point?
Correct answer: D. 1/3 sec
- A. 1200 sec
- B. 12 sec
- C. 3 sec
- D. 1/3 sec
Explanation
Frequency = 60 Hz this means that the number of waves passing in 1 second is 60 So now the period becomes 1/60 As we know that T=1/60 so now the time taken by 20 waves is, T = 20 x 1/60 Time is taken = 20 / 60 Time taken = ⅓ seconds Mathematically the other options are incorrect.
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About Waves
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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