(a) DefinePhotoelectric effect ? Mention its one practical application in daily life. (b) Electrons are emitted with zero velocity from a mental surface when it is exposed to radiation of wavelength 6800 Å. Calculatethresholds freqency (V_o) and work function (W_o) of the mental.

(a) DefinePhotoelectric effect ? Mention its one practical application

1.	(a) DefinePhotoelectric effect ? Mention its one practical application in daily life. (b) Electrons are emitted with zero velocity from a mental surface when it is exposed to radiation of wavelength 6800 Å. Calculatethresholds freqency (V_o) and work function (W_o) of the mental.
Answer» ANSWER :`v_o=4.41 XX 10^(14) s^(-1) W_o= 2.92 xx 10^(-19)` J