Modern Physics
The threshold frequency for a photo-sensitine metal is $$3.3\times { 10 }^{ 14 }Hz$$. If light of frequency $$8.2\times { 10 }^{ 14 }Hz$$ is incident on this metal, the cut-off voltage for the photo-electric emission is nearly
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Single Choice
According to Einsteins photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is :
A
B
C
D
Correct Answer
Solution
The maximum kinetic energy of photoelectron ejected is given by,
$$K.E. = h\upsilon \, - \, \phi _{0} \, = \, h\upsilon \,-\, h\upsilon _{0}$$
Where work function depends on the type of material.
If the frequency of incident radiation is greater than $$\upsilon _{0}$$ only then the ejection of photoelectrons start. After that as frequency increases kinetic energy also increases.
Option D
SIMILAR QUESTIONS
Modern Physics
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Modern Physics
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Modern Physics
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Modern Physics
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Modern Physics
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Modern Physics
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Modern Physics
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Modern Physics
In a photocell circuit the stopping potential, $$v_0$$ , is a measure of the maximum kinetic energy of the photoelectrons. The following graph shows experimentally measured values of stopping potential versus frequency v of incident light. The values of Planck's constant and the work function as determined from the graph are (taking the magnitude of electronic charge to be $$ e= 1.6 \times 10^{-19} C $$ )
Modern Physics
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