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Asked in PMC Practice Test 18 (2021) 2021

Time period of the wave is 1/4 sec. How long does it take to pass 20 complete waves from a point?

Correct answer: A. 5 sec

  • A. 5 sec
  • B. 80 sec
  • C. 1/80 sec
  • D. 1/5 sec

Explanation

Time taken by 1 wave = ¼ sec Time taken by 20 waves = x sec x = 20 (¼) = 20/4 x = 5 sec The time taken by 20 waves is 5 s. This is numerical so it can only have one answer so option A is correct

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About Progressive Waves

Progressive waves transfer energy through a medium or space while particles oscillate about their equilibrium positions. The work includes amplitude, wavelength, frequency, period, phase difference, wave speed and the progressive wave equation, while distinguishing travelling waves from stationary waves, where the pattern has fixed nodes and antinodes.

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