A sinusoidal wave produced in a stretched string gets reflected and loses `36%` of its energy in getting reflected from the fixed end of the string. Choose the correct statement from the

Options

A. `("Amplitude of reflected wave")/("Amplitude of incident wave")=(8)/(10)`
B. Phase difference between incident and reflected wave is `pi`.
C. `("Frequency of reflected wave")/("Frequency of incident wave")=(4)/(5)`
D. None of the above

Explanation

Let the incident wave has intensity `=I`
So, intensity of reflected wave `=0.64I`
`I prop A_(1)^(2)`
And, `0.641 prop A^(2)`
So `((A_(1))/(A_(R )))^(2)=((1)/(0.64))`
`rArr (A_(2))/(A_(1))=(4)/(5)`