The amplitude of a wave at an instant is represented by displacement equation y = 1asin ωt±1bcosωt will be

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a+bab

a±bab

a+bab

answer is D.

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Detailed Solution

y = 1asinωt ±1bsin(ωt+π2)Here phase difference = π2Resultant amp = (1a)2+(1b)2 = 1a+1b = a+bab

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