1.

`y=3cos 100pi(2t-x)`, the value of `lamda` isA. 4cmB. 6cmC. 2cmD. 1cm

Answer» Correct Answer - C
`y=3cos100pi(2t-x)`
`k=100pi`
`(2pi)/(lamda) = 100pi`
`lamda = (2)/(100) = 0.02 m = 2cm`


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