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JEE Main201912 Apr 2019Morning ShiftPhysicsWaves and SoundActual

A progressive wave travelling along the positive x - direction is represented by y x , t = A s i n ( k x - ω t + ϕ ) . Its snapshot at t = 0 is given in the figure. For this wave, the phase ϕ is:

Options

  1. Aπ 2
  2. B0
  3. Cπ
  4. D- π 2

Correct answer

C. π

Step-by-step solution

y = A sin ( k x - ω t + ϕ ) at x = 0 ,   t = 0 ,   y = 0 and slope is negative ⇒ ϕ = π  

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