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Q.

Three waves of equal frequencies having amplitudes 10μm, 4μm and 7μm arrive of a given point. Phase difference between first and second wave is π2 and that between second and third wave is π2. .Then amplitude of the resulting wave in μm ,is

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a

7

b

6

c

5

d

4

answer is C.

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Detailed Solution

AR→=A1→+A2→+A3→∴AR=(A1−A3)2+A22             =(10−7)2+42μm=5μm
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Three waves of equal frequencies having amplitudes 10μm, 4μm and 7μm arrive of a given point. Phase difference between first and second wave is π2 and that between second and third wave is π2. .Then amplitude of the resulting wave in μm ,is