Which of the following figures represent the variation of the particle momentum and the associated de-Broglie wavelength?

1. 2.
3. 4.

Subtopic:  De-broglie Wavelength |
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When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increases from 0.5 eV to 0.8 eV. The work function of the metal is:

1. 0.65 eV

2. 1.0 eV

3. 1.3 eV

4. 1.5 eV

Subtopic:  Einstein's Photoelectric Equation |
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If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is :

1. 25

2. 75

3. 60

4. 50

Subtopic:  De-broglie Wavelength |
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For photoelectric emission from certain metals, the cutoff frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
(m is the electron mass)

1. /m

2. 2/m

3. 2/m

4. /2m

Subtopic:  Einstein's Photoelectric Equation |
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The wavelength λe of an electron and λP of a photon of same energy E are related by :
1. λP ∝ λe
2. λP ∝  λe
3. λP ∝ 1 λe
4. λP ∝ λe2
Subtopic:  De-broglie Wavelength |
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

1. 1.5×1020

2. 6×1018

3. 62×1020

4. 3×1019

Subtopic:  Photoelectric Effect: Experiment |
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An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de-Broglie wavelength associated with the particle will be :

1. 1 Ao
2. 0.1 Ao
3. 10 Ao
4. 0.01 Ao

Subtopic:  De-broglie Wavelength |
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In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by:

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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A radioactive nucleus of mass M emits a photon of frequency ν and the nucleus will recoil. The recoil energy will be

1.  h2ν22Mc2

2.  zero

3.  c2M

4.  c2M

Subtopic:  De-broglie Wavelength |
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In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:

1.  1.3 V

2.  0.5 V

3.  2.3 V

4.  1.8 V

Subtopic:  Photoelectric Effect: Experiment |
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