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The equation of a stationary wave is y = 0.8 cos (πx/20) sin 200πt, where x is in cm and t is in sec.

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The equation of a stationary wave is y = 0.8 cos (πx/20)  sin 200πt, 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

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Correct option (A) 20 cm

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