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Asked in PMC Practice Test 7 (2021) 2021

A sound wave has a wavelength of 0.20 m. What is the phase difference between two points along the wave which are 0.65 m apart?

Correct answer: C. 900

  • A. 00
  • B. 450
  • C. 900
  • D. 1800

Explanation

λ= 0.20m.Phase difference= 0.65mNearest integral multiple of wavelength to phase difference= 0.20 x 3= 0.60mNet phase difference = 0.65 - 0.60= 0.05mIn degrees = (phase difference/wavelength) x360= (0.05/0.20) x 360= 90 degrees

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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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