Question

the stopping
Ans. 6188 Å, 0.76 x 10-19 J, 0.475 V.
5. (1) When light of 3000 Å is incident on sodium
cathode, the stopping potential is 1.85 V; and when
light of 4000 Å is incident, then the stopping potential
becomes 0.82 V. Calculate : Planck's constant, work
function of sodium, threshold wavelength for sodium.
(ii) At stopping potential, if the wavelength of the
incident light is kept fixed at 4000 Å, but the intensity
of light is increased two times, will photoelectric
current be obtained? Give reasons for your answer.
Ans. (i) 6.6 x 10-34 J s, 2.275 eV, 5440 Å.
(ii) At the stopping potential, the photoelectric current
cannot be obtained by increasing the intensity of the
incident light, because the stopping potential (o
maximum kinetic energy of the photoelectrons) does
not depend upon the intensity of the incident light.
In a photoelectric cell, a retarding notential of 0 51​

Answer 1

Answer:

heurbeud fhf f r r jfbirbcie jccirb irb i