# Radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is: (c = velocity of light) 1. $$E \over c$$ 2. $$2E \over c$$ 3. $$2E \over c^2$$  4. $$E \over c^2$$

Subtopic:  Photoelectric Effect: Experiment |
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A certain metallic surface is illuminated with monochromatic light of wavelength $\mathrm{\lambda }$. The stopping potential for photoelectric current for this light is 3V0. If the same surface is illuminated with a light of wavelength 2$\mathrm{\lambda }$, the stopping potential is V0. The threshold wavelength for this surface for the photoelectric effect is:
1. $6\mathrm{\lambda }$
2. $4\mathrm{\lambda }$
3. $\frac{\mathrm{\lambda }}{4}$
4. $\frac{\mathrm{\lambda }}{6}$
Subtopic:  Einstein's Photoelectric Equation |
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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 $\nu$. 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 wavelength λe of an electron and λP of a photon of same energy E are related by :
1. λP ∝ λe
2. λP ∝
3. λP ∝
4. λP ∝ λe2
Subtopic:  De-broglie Wavelength |
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 $\mathrm{\mu m}$. 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. $1.5×{10}^{20}$

2. $6×{10}^{18}$

3. $62×{10}^{20}$

4. $3×{10}^{19}$

Subtopic:  Photoelectric Effect: Experiment |
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An $\mathrm{\alpha }$-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 :

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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