At certain instant the shape of a simple train of plane wave is y = 12 sin 
(x and y are in cm.). The velocity of the wave propagation is 100 cm/s in a positive direction away from the origin. The equation giving the shape of the wave 0.25s later is y = 12 sin 
. Find a × b
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(20)
y = 12 sin 
, at t = 0
y = 12 sin 
(x – vt)
y = 12 sin 
(x – 100 × 0.25)
So equation of shape of wave y = 12sin 
.
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