A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:
1. Equal to \(c\), the speed of light in vacuum.
2. Greater than \(c\).
3. Less than \(c\).
4. Tending to infinity.

Subtopic:  De-broglie Wavelength |
 76%
From NCERT
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If the following particles are moving at the same velocity, then which among them will have the maximum de-Broglie wavelength?
1. Neutron               

2. Proton

3. β-particle             

4. α-particle

Subtopic:  De-broglie Wavelength |
 59%
From NCERT
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What is the momentum of a photon in an \(X\text-\)ray beam of \(10^{-10}\) meter wavelength?
1. \(1.5 \times 10^{-23}~\text{kg-m/s}\)
2. \(6.6 \times 10^{-24}~\text{kg-m/s}\)
3. \(6.6 \times 10^{-44}~\text{kg-m/s}\)
4. \(2.2 \times 10^{-52}~\text{kg-m/s}\)
Subtopic:  De-broglie Wavelength |
 90%
From NCERT
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The energy of a quanta of frequency \(10^{15}\) Hz and \(h = 6.6 \times 10^{-34}~\text{J-s}\) will be:
1. \(6.6\times 10^{-19}~\text{J}\)
2. \(6.6\times 10^{-12}~\text{J}\)
3. \(6.6\times 10^{-49}~\text{J}\)
4. \(6.6\times 10^{-41}~\text{J}\)

Subtopic:  Particle Nature of Light |
 91%
From NCERT
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The number of photo-electrons emitted per second from a metal surface increases when:

1. The energy of incident photons increases. 2. The frequency of incident light increases.
3. The wavelength of the incident light increases. 4. The intensity of the incident light increases.
Subtopic:  Photoelectric Effect: Experiment |
 81%
From NCERT
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A photon of energy \(3.4\) eV is incident on a metal having a work function of \(2\) eV. The maximum K.E of photo-electrons is equal to:
1. \(1.4\) eV 2. \(1.7\) eV
3. \(5.4\) eV 4. \(6.8\) eV
Subtopic:  Einstein's Photoelectric Equation |
 91%
From NCERT
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A photocell is receiving light from a source placed at a distance of \(1\) m. If the same source is placed at a distance of \(2\) m, then the ejected electron:
1. moves with one-fourth of energy as that of the initial energy.
2. moves with one-fourth of momentum as that of the initial momentum.
3. will be half in number.
4. will be one-fourth in number.
Subtopic:  Electron Emission |
 65%
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The stopping potential for photoelectrons:

1. does not depend on the frequency of the incident light.
2. does not depend upon the nature of the cathode material.
3. depends on both the frequency of the incident light and the nature of the cathode material.
4. depends upon the intensity of the incident light.
Subtopic:  Photoelectric Effect: Experiment |
 72%
From NCERT
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If in a photoelectric experiment, the wavelength of incident radiation is reduced from \(6000~\mathring{A}\) to \(4000~\mathring{A}\), then:
1. The stopping potential will decrease.
2. The stopping potential will increase.
3. The kinetic energy of emitted electrons will decrease.
4. The value of the work function will decrease.
Subtopic:  Photoelectric Effect: Experiment |
 75%
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The value of stopping potential in the following diagram is given by:
   

1. \(-4\) V 2. \(-3\) V
3. \(-2\) V 4. \(-1\) V
Subtopic:  Photoelectric Effect: Experiment |
 90%
From NCERT
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