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Dual Nature of Radiation and Matter
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Experimental Study of Photoelectric Effect
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Photoelectric Effect - II
Photoelectric Effect - II
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REVISE WITH CONCEPTS
Observations on Photo Electric Effect
Example
Definitions
Formulaes
Important Questions
Light of frequency 1.5 times the threshold frequency is incident on photosensitive material. If the frequency is halved and intensity is doubled, the photo current becomes
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Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
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Write the experimental observations of Photoelectric effect.
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The threshold frequency for certain metal is
3
.
3
×
1
0
1
4
H
z
. If light of
8
.
2
×
1
0
1
4
H
z
frequency is incident on the metal, then the cut-off voltage of the photoelectric current will be :
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Write four laws of photoelectric effect.
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(a) Why photoelectric effect cannot be explained on the basis of wave nature of light? Give reasons.
(b) Write the basis features of photon picture of electron magnetic radiation on which Einstein's photoelectric equation is based.
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What is photoelectric effect? Explain the effect of increase (i) frequency (ii) intensity of incident radiation on photoelectric current with suitable graphs.
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The given graph shows the variations of photo-electric current (I) versus applied voltage (V) for two different photosensitive materials and for two different intensities of the incident radiations. Identify the pairs of curves that correspond to different materials but same intensity of incident radiations
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Explain how does (i) photoelectric current and (ii) kinetic energy of the photoelectrons emitted in a photocell vary if the frequency of incident radiation is doubled, but keeping the intensity same? Show the graphical variation in the above two cases.
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In photoelectric effect, the slope of the straight line graph between stopping potential and frequency of the incident light gives the ratio of Planck's constant to
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