If suitable light is allowed to fall on a clean metal surface, electrons are emitted from the surface. This phenomenon is called the photo - electric effect. Usually a radiation in the UV region and also in some cases in the visible region produces such an effect. The velocity and K.E. of the emitted electrons are measured by electric field . If wavelength of 470 nm falls on the surface of potassium metals, electrons are emitted with a velocity of 6.4 xx 10^(4) m sec^(-1)If bombarded light frequency is twice, then K.E. of emitted electrons is :

If suitable light is allowed to fall on a clean metal surface, electro

1.	If suitable light is allowed to fall on a clean metal surface, electrons are emitted from the surface. This phenomenon is called the photo - electric effect. Usually a radiation in the UV region and also in some cases in the visible region produces such an effect. The velocity and K.E. of the emitted electrons are measured by electric field . If wavelength of 470 nm falls on the surface of potassium metals, electrons are emitted with a velocity of 6.4 xx 10^(4) m sec^(-1)If bombarded light frequency is twice, then K.E. of emitted electrons is :
Answer» `1.86 XX 10^(-21) J` `4.24 xx 10^(-19) J` `1.98 xx 10^(-22)J` `4.25 xx 10^(-22)J` Answer :B