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Q. No.The de-Broglie wavelength of an electron is the same as that of a photon of wavelength \(\lambda\). If the mass of an electron is \(m,\) then its kinetic energy will be:
1.
\(\frac{h^{2} m}{2 \lambda^{2}}\)
2.
\(\frac{2 h m^{2}}{\lambda^{2}}\)
3.
\(\frac{h^{2} \lambda^{2}}{2 m}\)
4.
\(\frac{h^{2}}{2 m \lambda^{2}}\)
Subtopic: De-broglie Wavelength |
80%
Level 1: 80%+
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The variation of the kinetic energy \((K)\) of photoelectrons as a function of the frequency \((f)\) of the incident radiation is best shown by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Einstein's Photoelectric Equation |
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Level 2: 60%+
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On which surface is the electron beam made to fall in the Davisson-Germer experiment?
1. Iron crystals
2. Nickel crystals
3. Gold crystals
4. Cesium crystals
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Level 2: 60%+
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The correct graph between the maximum energy of a photoelectron \(\left(K_{max}\right)\) and the inverse of the wavelength \(\left(\frac{1}{\lambda}\right)\) of the incident radiation is given by the curve:
| 1. | \(A\) | 2. | \(B\) |
| 3. | \(C\) | 4. | None of these |
Subtopic: Einstein's Photoelectric Equation |
82%
Level 1: 80%+
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If alpha, beta and gamma rays carry the same momentum, which has the longest wavelength?
| 1. | Alpha rays | 2. | Beta rays |
| 3. | Gamma rays | 4. | None, all have same wavelength |
Subtopic: De-broglie Wavelength |
70%
Level 2: 60%+
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The photoelectric effect is used by a photocell to convert:
| 1. | Change in the frequency of light into a change in electric voltage. |
| 2. | Change in the intensity of illumination into a change in photoelectric current. |
| 3. | Change in the intensity of illumination into a change in the work function of the photocathode. |
| 4. | Change in the frequency of light into a change in the electric current. |
Subtopic: Photoelectric Effect: Experiment |
66%
Level 2: 60%+
AIPMT - 2006
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A \(200~\text{W}\) sodium street lamp emits yellow light of wavelength \(0.6~\mu\text{m}\). If it is \(25\%\) efficient in converting electrical energy to light, how many photons of yellow light does it emit per second?
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
Subtopic: Particle Nature of Light |
74%
Level 2: 60%+
AIPMT - 2012
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In the photoelectric emission process from a metal of work function \(1.8\) eV, the kinetic energy of most energetic electrons is \(0.5\) eV. What is the corresponding stopping potential?
1. \(1.3\) V
2. \(0.5\) V
3. \(2.3\) V
4. \(1.8\) V
1. \(1.3\) V
2. \(0.5\) V
3. \(2.3\) V
4. \(1.8\) V
Subtopic: Einstein's Photoelectric Equation |
77%
Level 2: 60%+
AIPMT - 2011
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Electrons used in an electron microscope are accelerated by a voltage of \(25\) kV. If the voltage were increased to \(100\) kV, then the de-Broglie wavelength associated with the electrons would:
| 1. | decrease by \(2\) times |
| 2. | decrease by \(4\) times |
| 3. | increase by \(4\) times |
| 4. | increase by \(2\) times |
Subtopic: De-broglie Wavelength |
80%
Level 1: 80%+
AIPMT - 2011
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A source \(S_1\) is producing, \(10^{15}\) photons per sec of wavelength \(5000~\mathring{A}.\) Another source \(S_2\) is producing \(1.02\times 10^{15}\) photons per second of wavelength \(5100~\mathring{A}.\) Then the ratio of the power of \(S_2\) to the power of \(S_1\) is equal to:
| 1. | \(1.00\) | 2. | \(1.02\) |
| 3. | \(1.04\) | 4. | \(0.98\) |
Subtopic: Particle Nature of Light |
77%
Level 2: 60%+
AIPMT - 2010
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