A photon of energy 3.4 eV is incident on a metal having a work function of 2 eV. The maximum K.E. of photo-electrons is equal to:

1. 1.4 eV

2. 1.7 eV

3. 5.4 eV

4. 6.8 eV

Subtopic:  Einstein's Photoelectric Equation |
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For photoelectric emission from certain metals, the cutoff frequency is $\nu$. If radiation of frequency 2$\mathrm{\nu }$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
(m is the electron mass)

1. $\sqrt{\mathrm{h\nu }/\mathrm{m}}$

2. $\sqrt{2\mathrm{h\nu }/\mathrm{m}}$

3. $2\sqrt{\mathrm{h\nu }/\mathrm{m}}$

4. $\sqrt{\mathrm{h\nu }/\left(2\mathrm{m}\right)}$

Subtopic:  Einstein's Photoelectric Equation |
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The work function of a metal surface is φ = 1.5 eV. If a light of wavelength 5000 Å falls on it, then the maximum K.E. of the ejected electron will be:

1. 1.2 eV

2. 0.98 eV

3. 0.45 eV

4. 0 eV

Subtopic:  Einstein's Photoelectric Equation |
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When monochromatic photons of wavelength 4000 Å are incident on the metal plate of work function 2.1 eV, what will be the stopping potential for the photocurrent?

1.  1 V

2.  2.1 V

3.  3.1 V

4.  Zero

Subtopic:  Einstein's Photoelectric Equation |
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The correct graph between the maximum energy of a photoelectron and the inverse of the wavelength of the incident radiation is given by the curve:

1.  A

2.  B

3.  C

4.  None of these

Subtopic:  Einstein's Photoelectric Equation |
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A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photoelectric current for this light is 3Vo. If the same surface is illuminated with light of wavelength 2λ, the stopping potential is Vo. The photoelectric effect's threshold wavelength for this surface is?

1. 6λ

2. 4λ

3. λ/4

4. λ/6

Subtopic:  Einstein's Photoelectric Equation |
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The work function of a metal surface is 2 eV. When the light of frequency f is incident on the surface, the maximum kinetic energy of the photoelectrons emitted is 5 eV. If the frequency of the incident light is increased to 4f, then the maximum kinetic energy of the photoelectron emitted will be:

1.  20 eV

2.  22  eV

3.  26 eV

4.  28 eV

Subtopic:  Einstein's Photoelectric Equation |
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The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation, the metals that will emit photoelectrons for a radiation of wavelength 4100 Å is/are:

1. None

2. A only

3. A and B only

4. All the three metals

Subtopic:  Einstein's Photoelectric Equation |
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The variation of kinetic energy (K) of photoelectrons as a function of frequency (f) of the incident radiation is best shown by:

 1 2 3 4

Subtopic:  Einstein's Photoelectric Equation |
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A metallic surface is exposed to two radiations separately, one of wavelength 4000 Å and the other of 8000 Å. If the work function of metal is 1 eV, then the ratio of maximum kinetic energies of photoelectrons is nearly equal to:

1.  $\frac{32}{11}$

2.  $\frac{42}{11}$

3.  $\frac{52}{11}$

4.  $\frac{62}{11}$

Subtopic:  Einstein's Photoelectric Equation |
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