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Questions  

Consider the three waves z1, z2  and  z3 as
 z1=Asin(kxωt)z2=Asin(kx+ωt)
and  z3=Asin(kyωt). Which of the following represents a standing wave 
 

a
z1+z2
b
z2+z3
c
z3+z1
d
z1+z2+z3

detailed solution

Correct option is A

Waves Z1=Asin(kx−ωt) is travelling towards positive x-direction.Wave  Z2=Asin(kx+ωt), is travelling towards negative x-direction. Wave Z3=Asin(ky−ωt) is travelling towards positive y direction.Since waves Z1 and Z2 are travelling along the same line so they will produce stationary wave.

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