EASY
12th Uttar Pradesh Board
IMPORTANT
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The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations .Which one of the following is a correct statement ?
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Important Questions on Dual Nature of Radiation and Matter
EASY
12th Uttar Pradesh Board
IMPORTANT
A cathode emits electrons per second, when heated. When is applied to anode all the emitted electrons reach the anode. The charge on electron is . The maximum anode current is
EASY
12th Uttar Pradesh Board
IMPORTANT
The following graph shows the variation of stopping potential with frequency of the incident radiation for two photosensitive metals and :
Which metal,
(i) has smaller threshold wavelength.
(ii) has smaller kinetic energy.
MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Factors on which the stopping potential depends upon?
EASY
12th Uttar Pradesh Board
IMPORTANT
To observe photo-electric effect the frequency of incident light should be more than which frequency?
EASY
12th Uttar Pradesh Board
IMPORTANT
What is photo-electric effect?
EASY
12th Uttar Pradesh Board
IMPORTANT
For a certain metal threshold wavelength is . Calculate the work function of the metal.
HARD
12th Uttar Pradesh Board
IMPORTANT
When a metallic surface is illuminated with light of frequency the maximum kinetic energy of emitted electrons is . When the same surface is illuminated by light of frequency the maximum kinetic energy of emitted electrons is . Find out work function of the metal.
MEDIUM
12th Uttar Pradesh Board
IMPORTANT
The frequency of a photon of frequency f after falling through height H in the uniform gravitational field due to earth is . Assume that photon manifest any increase in energy by changing frequency. Choose the correct relation : (Take acceleration due to gravity g)
