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10. The displacement of a wave is given by the equation y =   2 sin   π 1 . 6 64 t - x .  The frequency of the wave is :
(a) 30 Hz 
(b) 25 Hz 
(c) 20 Hz 
(d) 15 Hz 
 

y=2sin π1.664t-xy=2sin 64×π1.6t-π1.6xy=2sin 40πt-π1.6xComparing with y=A sin ωt-kxω=40πWe know ω=2πf2πf=40πf=20Hz

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