The curves (1), (2), (3) and (4) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light ( I1>I2). In which figure is the correct variation shown?

1. 2.
3. 4.

Subtopic:  Photoelectric Effect: Experiment |
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A stationary nucleus of mass number A emits an \(\alpha-\text{particle}\).  If the de-Broglie wavelength of the daughter nucleus is λ1 and that of the α-particle is λ2, then the ratio λ1λ2 is:

1.  4A - 4

2.  A - 44

3.  1

4.  A + 44

Subtopic:  De-broglie Wavelength |
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In the Davisson and Germer experiment, how can we increase the velocity of electrons emitted from the electron gun?

1. increasing the filament current.
2. decreasing the filament current.
3. decreasing the potential difference between the anode and filament.
4. increasing the potential difference between the anode and filament.
Subtopic:  Davisson & Germer Experiment |
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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 stopping potential of a photosensitive material is \(4~V\) when the wavelength of incident monochromatic radiation is \(\lambda.\) If the wavelength of incident radiation is doubled on the same photosensitive material, the stopping potential becomes \(V.\) The threshold wavelength of the photosensitive material will be:

1.  43λ

2.  32λ

3.  3λ

4.  λ4

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.  3211

2.  4211

3.  5211

4.  6211

Subtopic:  Einstein's Photoelectric Equation |
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The figure shows the variation in photoelectric current (i) with voltage (V) between the electrodes in a photocell for two different radiations. If Ia and Ib are the intensities of the incident radiation and νa and νb their respective frequencies, then:

   

1.  Ia > Ib , νb < νa

2.  Ia < Ib , νb > νa

3.  Ia > Ib , νb = νa

4.  Ia < Ib , νb < νa

Subtopic:  Photoelectric Effect: Experiment |
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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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When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and saturation current are 0.6 volts and 18 mA respectively. What will happen if the same source is placed 0.6 m away from the photoelectric cell?

1.  the stopping potential will be 0.2 volts.

2.  the stopping potential will be 0.6 volts.

3.  the saturation current will be 6 mA.

4.  the saturation current will be 18 mA.

Subtopic:  Einstein's Photoelectric Equation |
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The de-Broglie wavelength of an electron is the same as that of a photon of wavelength λ . If the mass of an electron is m, then its kinetic energy will be:

1.  h2m2λ2

2.  2hm2λ2

3.  h2λ22m

4.  h22mλ2

Subtopic:  De-broglie Wavelength |
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