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 |
 60%
From NCERT
NEET - 2022
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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 |
 81%
From NCERT
NEET - 2022
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The light rays having photons of energy \(4.2~\text{eV}\) are falling on a metal surface having a work function of \(2.2~\text{eV}\) . The stopping potential of the surface is:
1. \(2~\text{eV}\) 2. \(2~\text{V}\)
3. \(1.1~\text{V}\) 4. \(6.4~\text{V}\)
Subtopic:  Einstein's Photoelectric Equation |
 63%
From NCERT
NEET - 2022
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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:
1. \(h\nu_0\) 2. \(2h\nu_0\)
3. \(3h\nu_0\) 4. \(4h\nu_0\)
Subtopic:  Einstein's Photoelectric Equation |
 82%
From NCERT
NEET - 2022
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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 |
 81%
From NCERT
NEET - 2022
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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. \(\frac{2}{3} \nu\)
Subtopic:  Einstein's Photoelectric Equation |
 68%
From NCERT
NEET - 2022
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The work functions of Caesium \((\mathrm{Cs})\), Potassium \((\mathrm{K})\) and Sodium \((\mathrm{Na})\) are \(2.14~\text{eV}\), \(2.30~\text{eV}\) and \(2.75~\text{eV}\) respectively. If incident electromagnetic radiation has an incident energy of \(2.20~\text{eV}\). which of these photosensitive surfaces may emit photoelectrons?
1. \(\mathrm{Na}\) only 2. \(\mathrm{Cs}\) only
3. Both \(\mathrm{Na}\) and \(\mathrm{K}\) 4. \(\mathrm{K}\) only
Subtopic:  Photoelectric Effect: Experiment |
 62%
From NCERT
NEET - 2023
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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
Subtopic:  De-broglie Wavelength |
 54%
From NCERT
NEET - 2023
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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 |
 77%
From NCERT
NEET - 2023
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An electromagnetic wave of wavelength \(\lambda\) is incident on a photosensitive surface of negligible work function. If '\(m\)' is the mass of photoelectron emitted from the surface and \(\lambda_d\) is the de-Broglie wavelength, then:
1. \( \lambda=\left(\frac{2 {mc}}{{h}}\right) \lambda_{{d}}^2 \)
2. \( \lambda=\left(\frac{2 {h}}{{mc}}\right) \lambda_{{d}}^2 \)
3. \( \lambda=\left(\frac{2 {m}}{{hc}}\right) \lambda_{{d}}^2\)
4. \( \lambda_{{d}}=\left(\frac{2 {mc}}{{h}}\right) \lambda^2 \)

Subtopic:  De-broglie Wavelength |
 54%
From NCERT
NEET - 2021
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