A proton and an α-particle are accelerated through a potential difference of 100 V. What is the ratio of the wavelength associated with the proton to that of the alpha-particle?
1. 2:1              

2. 2:1

3. 22:1             

4. 122:1

Subtopic:  De-broglie Wavelength |
 67%
From NCERT
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What is the momentum of a photon in an X-ray beam of 10-10 meter wavelength?

1. \(1.5 \times 10^{-23} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)
2. \(6.6 \times 10^{-24} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)
3. \(6.6 \times 10^{-44} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)
4. \(2.2 \times 10^{-52} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)

Subtopic:  De-broglie Wavelength |
 90%
From NCERT
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The energy of a quanta of frequency 1015 Hz and h=6.6×10-34 J-sec will be:

1. 6.6×10-19 J

2.6.6×10-12 J

3. 6.6×10-49 J

4.6.6×10-41 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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The spectrum of radiation 1.0 x 1014 Hz is in the infrared region. The energy of one photon of this in joules will be:

1. 6.62×10-48
2. 6.62×10-20
3. 6.623×10-28
4. 3×6.62×10-28

Subtopic:  Particle Nature of Light |
 89%
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%
From NCERT
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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 Å to 4000 Å, 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%
From NCERT
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The stopping potential V for photoelectric emission from a metal surface is plotted along the Y-axis and the frequency \(\nu\) of incident light along the X-axis. A straight line is obtained as shown in the figure. Planck's constant is given by:
 

1. the slope of the line.
2. the product of slope on the line and charge on the electron.
3. the product of intercept along the Y-axis and mass of the electron.
4. the product of the slope and mass of the electron.
Subtopic:  Einstein's Photoelectric Equation |
 67%
From NCERT
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