Photoelectric Effects and deBroglie Equation - NEET Physics Questions
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Photoelectric Effects and deBroglie Equation

Practice Questions:
Question 11: moderate

The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as given below :

1.
2.
3.
4.
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Question 12: moderate

If the momentum of an electron is changed by P, then de-Broglie wavelength associated with it
changes by 0.2%. The initial momentum of electron will be about :

1. P/200
2. 100 P
3. 500 P
4. 400 P
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Question 13: moderate

In photoelectric effect, the curve between photoelectric current and anode potential V (for
different frequencies) is shown in figure, then :

1. \[\nu_{1}>\nu_{2}>\nu_{3}\]
2. \[\nu_{1}<\nu_{2}<\nu_{3}\]
3. \[\nu_{1}=\nu_{2}=\nu_{3}\]
4. \[\nu_{1}>\nu_{2}<\nu_{3}\]
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Question 14: moderate

If the kinetic energy of the particle is increased to 16 times its previous value, the percentage
change in the de-Broglie wavelength of the particle is :

1. 25
2. 75
3. 60
4. 50
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