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Three harmonic waves having equal frequency and same intensity , have phase angles and respectively. When they are superimposed the intensity of the resultant wave is close to:
(a)
(b)
(c)
(d)
(e)

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Important Questions on Wave Motion on a String
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The equations of two waves are given by :
These waves are simultaneously passing through a string. The amplitude of the resulting wave is :

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(Acceleration due to gravity )

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Two identical coherent sound sources and with frequency are apart. An observer standing equidistant from the source and at a perpendicular distance of from the line hears maximum sound intensity.
When he moves parallel to , the sound intensity varies and is a minimum when he comes directly in front of one of the two sources. Then, a possible value of is close to (the speed of sound is )

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