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The equation for a certain wave on a str...

The equation for a certain wave on a string is, `y=7*10^(-2) sin(5πx)cos(8t)`. What is the length of the shortest string that could be used? ( Where y and x are in meter and t is in second)

A

`0.4 m`

B

`0.3 m`

C

`0.2 m`

D

`0.1 m`

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