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Questions  

The equation of a stationary wave is y=0.8cosπx20sin200πt, where x is in cm and t is in sec. The separation between consecutive nodes will be

a
20 cm
b
10 cm
c
40 cm
d
30 cm

detailed solution

Correct option is A

On comparing the given equation with standard equation y=2a sin2πxλ cos 2πvtλ]We get 2πλ=π20⇒λ=40Separation between two consecutive nodes = λ2=402=20  cm

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