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Q.

A wave is represented by the equation y=2sin10πx+15πt+π3 where y is in centimetre, x is in metres and t is in seconds. The expression represents

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a

A wave traveling in the negative x-direction with a velocity of 1.5m/s 

b

At t = 0 and x = 0 , velocity of a particle of the medium is  15π cm/s.

c

A wave traveling in the negative x-direction with a wave length of 0.2 metre

d

A wave traveling in the positive x-direction with a velocity of 1.5m/s

answer is B, C, D.

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Detailed Solution

Comparing the given equation with the standard form 

y=Asin(ωt±kx+δ), we get ω=15π,k=10π and wave is propagating along negative x-direction. Wave speed, V=ωk=32m/s 

Wavelength, λ=2π10π=0.2m

Particle velocity VP=δyδt=2×15π cos (10πx + 15πt+π3).At x=0 and t = 0,VP=15π cm/s .

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