In the experiment on photoelectric effect, the graph between `E_K(max)` and v is found to be a straight line as sshoen in fig. The threshold frequency and Planck's constant according to this graph are

Options

A. `3.33xx10^18s^-1`,`6xx10^-34J-s`
B. `6..10^18s^-1`,`6xx10^-34J-s`
C. `2.66xx10^18s^-1`,`4xx10^-34J-s`
D. `4xx10^18s^-1`,`3xx10^-34J-s`

Answer

A

Explanation

`K_(max)=hv-W`
`omega` is the intercept on y-axis and h is the slope.
`h=(2.4xx10^-15)/(4xx10^18)=6xx10^-34Js`
`W=2xx10^-15J`
`implieshv_0=2xx10^-15`
or `v_0=3.33xx10^18`