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The stationary waves set up on a string ...

The stationary waves set up on a string have the equation :
`y = ( 2 mm) sin [ (6.28 m^(-1)) x] cos omega t`
The stationary wave is created by two identical waves , of amplitude `A` each , moving in opposite directions along the string . Then :

A

`A=2mm`

B

`A=1mm`

C

The smallest length of the string is `50cm`

D

The smallest length of the string is `2m`

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The correct Answer is:
B, C, D
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