Photoelectric EffectHard
Question
Light from a hydrogen discharge tube is incident on the cathode of a photoelectric cellthe work function of the cathode surface is 4.2 eV. In order to reduce the photocurrent to zero the voltage of the anode relative to the cathode must be made :-
Options
A.- 4.2 V
B.-9.4 V
C.-17.8 V
D.+9.4 V
Solution
ev0 = E - φ
= 13.6 - 4.2
ev0 = 9.4 ev
v0 = - 9.4v
= 13.6 - 4.2
ev0 = 9.4 ev
v0 = - 9.4v
Create a free account to view solution
View Solution FreeMore Photoelectric Effect Questions
For electron wavelength will be :...If an orbital electron of the hydrogen atom jumps from the ground state to a higher energy state, its orbital speed redu...For first order X-ray diffraction if lattice constant is 3 × 10-8 cm and glancing angle is 30o, then the value of l...When X-rays tube is operated at V0 voltage, it produces Kα X-ray of wavelength λ. Now voltage is made then wav...The work done in splitting a drop of water of 1 mm radius in to 106 droplets is (surface tansion of water 72 × 10-3...