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12th ICSE
IMPORTANT
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If the intensity of light falling on the emitting substance of a photoelectric cell be increased, then what will be the effect on: (i) the current flowing from the cell, (ii) potential difference required to stop the current completely?

Important Questions on Photoelectric Effect

MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 2
Yellow light incident on the cathode of a photoelectric cell is replaced by blue light and the intensity of light is also increased. The current from the cell increases and the potential difference required to stop the current completely also increases. State which effect is produced due to which change.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 3
Explain the variation of photoelectric current in a photo-tube with voltage across the tube.
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 3
Explain the variation of photoelectric current in a photo-tube with intensity of incident radiation, with graphs.
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 4
Explain the meaning of photoelectric work function of a metal. How does its value affect the kinetic energy of the liberated photoelectrons?
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 5
No photoelectrons can be liberated from a metal surface, if the wavelength of the incident light exceeds a certain value. Why?
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 6
With reference to photoelectric effect, define threshold wavelength.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 7
How does the stopping potential depend upon the frequency and the intensity of the incident light? Explain by drawing graph.
EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 10 - Photoelectric Effect>QUESTIONS>Q 8

In photoelectric effect what is meant by the terms: work function of a metal.