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Q.

The equation of a wave motion (with t  in seconds and  x in metres) is given by y=7sin 7πt−0.4πx+π3. The velocity of the wave will be

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a

17.5 m/s

b

49πm/s

c

492πm/s

d

2π49m/s

answer is A.

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Detailed Solution

v=ωk=7π0.4π=17.5m/s
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The equation of a wave motion (with t  in seconds and  x in metres) is given by y=7sin 7πt−0.4πx+π3. The velocity of the wave will be