A photoelectric surface is illuminated successively by the monochromatic light of wavelength λ and λ2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the mineral is :
[h=Plank’s constant, c=speed of light]

1. hc2λ

2. hcλ

3. 2hcλ

4. hc3λ

Subtopic:  Einstein's Photoelectric Equation |
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Light of wavelength 500 nm is incident on metal with work function 2.28 eV. The de-Broglie wavelength of the emitted electron is:

1. \(< 2.8\times 10^{-10}\) m

2. \(< 2.8\times 10^{-9}\) m

3. \(\geq 2.8\times 10^{-9}\) m

4. \(\leq 2.8\times 10^{-12}\) m

Subtopic:  Einstein's Photoelectric Equation |
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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 λ. The stopping potential for photoelectric current for this light is 3V0. If the same surface is illuminated with a light of wavelength 2λ, the stopping potential is V0. The threshold wavelength for this surface for the photoelectric effect is:
1. 6λ
2. 4λ
3. λ4
4. λ6
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 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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