1
WB JEE 2024
MCQ (More than One Correct Answer)
+2
-0
Change Language
Monochromatic light of wavelength $$\lambda=4770 \mathop A\limits^o $$ is incident separately on the surfaces of four different metals A, B, C and D. The work functions of A, B, C and D are $$4.2 \mathrm{~eV}, 3.7 \mathrm{~eV}, 3.2 \mathrm{~eV}$$ and $$2.3 \mathrm{~eV}$$, respectively. The metal / metals from which electrons will be emitted is / are
A
A, B, C and D
B
B, C and D
C
C and D
D
D only
2
WB JEE 2021
MCQ (More than One Correct Answer)
+2
-0
Change Language
Electric field component of an EM radiation varies with time as E = a (cos$$\omega$$0t + sin$$\omega$$t cos$$\omega$$0t), where a is a constant and $$\omega$$ = 1015 s$$-$$1, $$\omega$$0 = 5 $$\times$$ 1015 s$$-$$1. This radiation falls on a metal whose stopping potential is $$-$$2 eV. Then, which of the following statements is/are true ? (h = 6.62 $$\times$$ 10$$-$$34 J-s)
A
For light of frequency $$\omega$$, photoelectric effect is not possible.
B
Stopping potential versus frequency graph will be a straight line.
C
The work function of the mutual is $$-$$2 eV.
D
The maximum kinetic energy of the photoelectrons is $$-$$2 eV.
3
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-0
Change Language
A point source of light is used in an experiment of photoelectric effects. If the distance between the source and the photoelectric surface is doubled, which of the following may result?
A
Stopping potential will be halved.
B
Photoelectric current will decrease.
C
Maximum kinetic energy of photoelectrons will decrease.
D
Stopping potential will increase slightly.
4
WB JEE 2019
MCQ (More than One Correct Answer)
+2
-0
Change Language
Electrons are emitted with kinetic energy T from a metal plate by an irradiation of light of intensity J and frequency v. Then, which of the following will be true?
A
T $$ \propto $$ J
B
T linearly increasing with v
C
T $$ \propto $$ time of irradiation
D
Number of electrons emitted $$ \propto $$ J
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