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Q. No.Let \(K_{1}\) and \(K_{2}\) be the maximum kinetic energies of photo-electrons emitted when two monochromatic beams of wavelength \(\lambda_1\) and \(\lambda_2\), respectively, are incident on a metallic surface. If \(\lambda_1 = 3 \lambda_2,\) then:
1.
\(K_1>\dfrac{K_2}{3} \)
2.
\({K}_1<\dfrac{{K}_2}{3} \)
3.
\({K}_1=\dfrac{{K}_2}{3} \)
4.
\({K}_2=\dfrac{{K}_1}{3}\)
Subtopic: Einstein's Photoelectric Equation |
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From NCERT
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An electron, an alpha particle, and a proton, all have the same kinetic energy. Which of the following relations is true regarding their de-Broglie wavelengths?
| 1. | \(\lambda_{\text{electron}}< \lambda_{\text{alpha}}<\lambda_{\text{proton}}\) |
| 2. | \( \lambda_{\text{alpha}}<\lambda_{\text{proton}}<\lambda_{\text{electron}}\) |
| 3. | \(\lambda_{\text{alpha}}>\lambda_{\text{proton}}>\lambda_{\text{electron}}\) |
| 4. | \(\lambda_{\text{proton}}>\lambda_{\text{alpha}}>\lambda_{\text{electron}}\) |
Subtopic: De-broglie Wavelength |
85%
From NCERT
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The stopping potential \({(V)}\) versus frequency \({(f)}\) of incident radiation is plotted for two photoelectric surfaces \({A}\) and \({B}.\) We can say that the work function of \({A}\):
| 1. | is equal to that of \({B}\) |
| 2. | is greater than that of \({B}\) |
| 3. | is smaller than that of \({B}\) |
| 4. | cannot be related to that of \({B}\) from the graph |
Subtopic: Einstein's Photoelectric Equation |
75%
From NCERT
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The de-Broglie wavelength of an electron, when accelerated through a potential difference of \(49~\text{V},\) is nearly:
1. \(0.0175~\text{nm}\)
2. \(0.175~\text{nm}\)
3. \(0.175~\mu\text{m}\)
4. \(0.175~\text{mm}\)
1. \(0.0175~\text{nm}\)
2. \(0.175~\text{nm}\)
3. \(0.175~\mu\text{m}\)
4. \(0.175~\text{mm}\)
Subtopic: De-broglie Wavelength |
80%
From NCERT
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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 |
86%
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. \(6.4~\text{V}\)
1. \(2~\text{eV}\)
2. \(2~\text{V}\)
3. \(1.1~\text{V}\)
4. \(6.4~\text{V}\)
Subtopic: Einstein's Photoelectric Equation |
67%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
Two beams of monochromatic light of frequencies \(\nu_1\) and \(\nu_2,\) are incident on the surface of a photo-sensitive material. Photo electrons are emitted with maximum kinetic energies \(E_1\) and \(E_2,\) respectively. If the ratio \(E_1:E_2=1:n\), the cut-off frequency for the material is:
| 1. | \(\dfrac{n\nu_1+\nu_2}{n+1}\) | 2. | \(\dfrac{n\nu_1-\nu_2}{n-1}\) |
| 3. | \(\dfrac{n\nu_1-\nu_2}{n+1}\) | 4. | \(\dfrac{n\nu_1+\nu_2}{n-1}\) |
Subtopic: Einstein's Photoelectric Equation |
75%
From NCERT
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A nucleus of mass \(M,\) initially at rest, splits into two fragments with masses \(\dfrac{M'}{ 3}\) and \(\dfrac{2M'} { 3}\) \((M'<M).\) The ratio of the de-Broglie wavelengths of the two fragments is:
| 1. | \(1:2\) | 2. | \(2:1\) |
| 3. | \(1:1\) | 4. | \(2:3\) |
Subtopic: De-broglie Wavelength |
56%
From NCERT
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The ratio of wavelengths of proton and deuteron accelerated by potential \(V_{p}\) and \(V_{d}\) is \(1:\sqrt2.\) Then, the ratio of \(V_{p}\) to \(V_{d}\) will be:
1. \(1:1\)
2. \(\sqrt 2: 1\)
3. \(2:1\)
4. \(4:1\)
1. \(1:1\)
2. \(\sqrt 2: 1\)
3. \(2:1\)
4. \(4:1\)
Subtopic: De-broglie Wavelength |
From NCERT
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Light of two different frequencies whose photons have energies \(1~\text{eV}\) and \(2.5~\text{eV}\) respectively, successively illuminate a metal whose work function is \(0.5~\text{eV}\). The ratio of the maximum speeds of the emitted electrons will be:
1. \(1:5\)
2. \(1:4\)
3. \(1:2\)
4. \(1:1\)
1. \(1:5\)
2. \(1:4\)
3. \(1:2\)
4. \(1:1\)
Subtopic: Einstein's Photoelectric Equation |
76%
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