The number of photons per second on an average emitted by a source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3×10-3 watt will be: h=6.6×10-34 Js

1. 1016

2. 1015

3. 1018

4. 1017

Subtopic:  Particle Nature of Light |
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An electromagnetic wave of wavelength \(\lambda\) is incident on a photosensitive surface of negligible work function. If 'm' is mass of photoelectron emitted from the surface and \(\lambda_d\) is the de-Broglie wavelength, then:

1. λ=2mchλd2

2. λ=2hmcλd2

3. λ=2mhcλd2

4. λd=2mchλ2

Subtopic:  De-broglie Wavelength |
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Light of a frequency of 1.5 times the threshold frequency is incident on a photosensitive material. What happens to the photoelectric current when the frequency is cut in half and the intensity is doubled?

1. four times

2. one-fourth

3. zero

4. doubled

Subtopic:  Photoelectric Effect: Experiment |
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An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of electron is 1.227×10-2 nm, what will be its potential difference?

1. 102 V

2. 103 V

3. 104 V

4. 105 V

Subtopic:  De-broglie Wavelength |
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An electron with 144 eV of kinetic energy has a de-Broglie wavelength that is very similar to?

1.  102 × 10-3 nm

2.  102 × 10-4 nm

3.  102 × 10-5 nm

4.  102 × 10-2 nm

Subtopic:  De-broglie Wavelength |
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Which among the following verified the wave nature of electrons experimentally?

1. De-Broglie 

2. Hertz

3. Einstein 

4. Davisson and Germer 

Subtopic:  Davisson & Germer Experiment |
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An electron is accelerated through a potential difference of 10,000 V. Its de-Broglie wavelength is, (nearly) : (me= 9×10-31kg)

1. 12.2 nm

2. 12.2×10-13m

3. 12.2×10-12m

4. 12.2×10-14m

Subtopic:  De-broglie Wavelength |
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The work function of the photosensitive material is 4.0 eV. The longest wavelength of light that can cause photoelectric emission from the substance is (approximately) :

1. 3100 nm

2. 966 nm

3. 31 nm

4. 310 nm

Subtopic:  Photoelectric Effect: Experiment |
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A proton and an α-particle are accelerated from rest to the same energy. The de-Broglie wavelength λp and λα are in the ratio:

1. 2:1

2. 1:1

3. 2:1

4. 4:1

Subtopic:  De-broglie Wavelength |
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An electron of mass m with an initial velocity v=v0i^ \((v_o>0)\) enters in an electric field E=-E0i^ (Eo = constant>0) at t=0. If λ0, is its de-Broglie wavelength initially, then what will be its de-Broglie wavelength at time t?

1. λ01+eE0mv0t

2. λ01+eE0mv0t

3. λ0t

4. λ0

Subtopic:  De-broglie Wavelength |
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