Light described at a place by the equation `E = (100V//M) xx [sin (5 xx 10^(15) s^(-1)) t +sin (8 xx 10^(15) s^(-1))t]`
falls on a metal surface having work fucntion `2.0eV`. Calculate the maximum kinetic energy of the similar having work function `1.9eV`

Options

A. `3.27 eV`
B. `5 eV`
C. `1.27 eV`
D. `2.5 eV`

Answer

A

Explanation

`E=100sin5xx10^(15)t+100sin8xx10^(15)t`
`V_(max)=(8xx10^(15))/(2pi),K.E_(max)=hv_(max)-w,K.E_(max)=3.27eV`