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Q. No.The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are \(2.14\) eV, \(2.30\) eV and \(2.75\) eV respectively. If incident electromagnetic radiation has an incident energy of \(2.20\) eV. which of these photosensitive surfaces may emit photoelectrons?
| 1. | Na only | 2. | Cs only |
| 3. | Both Na and K | 4. | K only |
Subtopic: Photoelectric Effect: Experiment |
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The de Broglie wavelength associated with an electron, accelerated by a potential difference of \(81\) V is given by:
1. \(13.6\) nm
2. \(136\) nm
3. \(1.36\) nm
4. \(0.136\) nm
1. \(13.6\) nm
2. \(136\) nm
3. \(1.36\) nm
4. \(0.136\) nm
Subtopic: De-broglie Wavelength |
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The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:
| 1. | work function of material | 2. | intensity of incident radiation |
| 3. | frequency of incident radiation | 4. | wavelength of incident radiation |
Subtopic: Photoelectric Effect: Experiment |
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When two monochromatic lights of frequency, \(\nu\) and \(\frac{\nu}{2}\) are incident on a photoelectric metal, their stopping potential becomes \(\frac{V_{s}}{2}\) and \(V_s\), respectively. The threshold frequency for this metal is:
1. \(\frac{3}{2} \nu\)
2. 2\(\nu\)
3. 3\(\nu\)
4. \(\frac{2}{3} \nu\)
1. \(\frac{3}{2} \nu\)
2. 2\(\nu\)
3. 3\(\nu\)
4. \(\frac{2}{3} \nu\)
Subtopic: Einstein's Photoelectric Equation |
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The graph which shows the variation of de Broglie wavelength \((\lambda)\) of a particle and its associated momentum \((p)\) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: De-broglie Wavelength |
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The de-Broglie wavelength of the thermal electron at \(27^\circ \text{C}\) is \(\lambda.\) When the temperature is increased to \(927^\circ \text{C},\) its de-Broglie wavelength will become:
1. \(2\lambda\)
2. \(4\lambda\)
3. \(\frac\lambda2\)
4. \(\frac\lambda4\)
Subtopic: De-broglie Wavelength |
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In a photoelectric experiment, blue light is capable of ejecting a photoelectron from a specific metal while green light is not able to eject a photoelectron. Ejection of photoelectrons is also possible using light of the colour:
1. yellow
2. red
3. violet
4. orange
Subtopic: Photoelectric Effect: Experiment |
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The light rays having photons of energy \(4.2\) eV are falling on a metal surface having a work function of \(2.2\) eV. The stopping potential of the surface is:
| 1. | \(2\) eV | 2. | \(2\) V |
| 3. | \(1.1\) V | 4. | \(6.4\) V |
Subtopic: Einstein's Photoelectric Equation |
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The threshold frequency of a photoelectric metal is \(\nu_0.\) If the light of frequency \(4\nu_0\) is incident on this metal,
then the maximum kinetic energy of emitted electrons will be:
then the maximum kinetic energy of emitted electrons will be:
| 1. | \(h\nu_0\) | 2. | \(2h\nu_0\) |
| 3. | \(3h\nu_0\) | 4. | \(4h\nu_0\) |
Subtopic: Einstein's Photoelectric Equation |
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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 watt will be: \((h = 6.6\times10^{-34}~\text{J-s})\)
1.
2.
3.
4.
Subtopic: Particle Nature of Light |
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