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The equation of a stationary wave is y= ...

The equation of a stationary wave is `y= 4 sin ((pix)/(5)) cos (100pi t)` . The wave is formed using a string of length 20cm. The second and 3rd antipodes are located at positions (in cm)

A

7.5, 12.5

B

2.5, 7.5

C

12.5, 17,5

D

5, 10

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The correct Answer is:
A
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