The equation `y=A cos^(2) (2pi nt -2 pi (x)/(lambda))` represents a wave with

Options

A. `(A)/(2)`, `2n` and `(lambda)/(2)`
B. `(A)/(2)`, `2n` and `lambda`
C. `A,2n` and `2lambda`
D. `A,n` and `lambda`

Answer

A

Explanation

`y=Acos^(2)[2pint-(2pix)/(lambda)]`, but `cos^(2)theta=((1+cos2theta))/(2)`
`:.y=(A)/(2)+(A)/(2)cos[2pi(2n)t-(2pix)/(lambda//2)]`