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JAMB Physics 2006 Question 36

Question 36

Waves

A progressive wave equation is represented by y = a sin (150 πt − πx/4). If the phase difference of a progressive wave is 45°, the value of x in the equation is

  1. A.3cm.
  2. B.4cm.
  3. C.2 cm.
  4. D.1 cm.
Show the answer and explanation

Answer: D (1 cm.)

Explanation

The phase term is πx/4. A phase difference of 45° = π/4 rad, so πx/4 = π/4 and x = 1 cm.