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JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
1
Medium
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Understanding
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In photo electric effect
A. The photocurrent is proportional to the intensity
of the incident radiation.
B. Maximum kinetic energy with which
photoelectrons are emitted depends on the
intensity of incident light.
C. Max. K.E with which photoelectrons are emitted
depends on the frequency of incident light.
D. The emission of photoelectrons require a
minimum threshold intensity of incident
radiation.
E. Max. K.E of the photoelectrons is independent
of the frequency of the incident light.
Choose the correct answer from the options given
below:
A. The photocurrent is proportional to the intensity
of the incident radiation.
B. Maximum kinetic energy with which
photoelectrons are emitted depends on the
intensity of incident light.
C. Max. K.E with which photoelectrons are emitted
depends on the frequency of incident light.
D. The emission of photoelectrons require a
minimum threshold intensity of incident
radiation.
E. Max. K.E of the photoelectrons is independent
of the frequency of the incident light.
Choose the correct answer from the options given
below:
View answer and explanation
Correct option: C
A and C only
Option C (A and C only) is correct because photocurrent is proportional to intensity, and maximum kinetic energy depends on the frequency of incident light.
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Photoelectrons are emitted from a metal surface when UV light of wavelength is incident on it. The minimum negative potential required to stop the emission of electrons is . Calculate:
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of