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JAMB Physics 2009 Question 27

Question 27

Waves

A progressive wave is represented by y = 10 sin (1000 t − πx/34). Two layers of the wave separated by 153cm have a phase difference of

  1. A.270°.
  2. B.45°.
  3. C.90°.
  4. D.180°.
Show the answer and explanation

Answer: C (90°.)

Explanation

Phase difference = πx/34 = π × 153/34 = 4.5π rad = 810°. Removing two whole cycles (720°) leaves 90°.