Q. No.A photon of energy \(3.4~\text{eV}\) is incident on a metal having a work function of \(2~\text{eV}.\) The maximum \(K.E\) of photo-electrons is equal to:
| 1. | \(1.4~\text{eV}\) | 2. | \(1.7~\text{eV}\) |
| 3. | \(5.4~\text{eV}\) | 4. | \(6.8~\text{eV}\) |
Subtopic: Einstein's Photoelectric Equation |
91%
From NCERT
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For photoelectric emission from certain metals, the cutoff frequency is \(\nu.\) If radiation of frequency \(2\nu\) impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
(\(m\) is the electron mass)
| 1. | \(\sqrt{\dfrac{h\nu}{m}}\) | 2. | \(\sqrt{\dfrac{2h\nu}{m}}\) |
| 3. | \(2\sqrt{\dfrac{h\nu}{m}}\) | 4. | \(\sqrt{\dfrac{h\nu}{2m}}\) |
Subtopic: Einstein's Photoelectric Equation |
84%
From NCERT
AIPMT - 2013
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When monochromatic photons of wavelength \(4000~\mathring{A}\) are incident on the metal plate of work function \(2.1~\text{eV},\) what will be the stopping potential for the photocurrent?
| 1. | \(1~\text V\) | 2. | \(2.1~\text V\) |
| 3. | \(3.1~\text V\) | 4. | Zero |
Subtopic: Einstein's Photoelectric Equation |
82%
From NCERT
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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 |
81%
From NCERT
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A certain metallic surface is illuminated with monochromatic light of wavelength \(\lambda\). The stopping potential for photoelectric current for this light is \(3V_0\). If the same surface is illuminated with light of wavelength \(2\lambda\), the stopping potential is \(V_0\). The photoelectric effect's threshold wavelength for this surface is?
1. \(6\lambda\)
2. \(4\lambda\)
3. \(\dfrac{\lambda}{4}\)
4. \(\dfrac{\lambda}{6}\)
1. \(6\lambda\)
2. \(4\lambda\)
3. \(\dfrac{\lambda}{4}\)
4. \(\dfrac{\lambda}{6}\)
Subtopic: Einstein's Photoelectric Equation |
77%
From NCERT
NEET - 2015
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The work functions for metals \(A,B,\) and \(C\) are respectively \(1.92\) eV, \(2.0\) eV, and \(5\) eV. According to Einstein's equation, the metals that will emit photoelectrons for a radiation of wavelength \(4100~\mathring{A}\) is/are:
1. None
2. \(A\) only
3. \(A\) and \(B\) only
4. All the three metals
Subtopic: Einstein's Photoelectric Equation |
80%
From NCERT
AIPMT - 2005
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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 |
73%
From NCERT
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Light of two different frequencies, whose photons have energies of \(1\) eV and \(2.5\) eV respectively, illuminates a metallic surface whose work function is \(0.5\) eV successively. The ratio of maximum speeds of emitted electrons will be:
1. \(1:2\)
2. \(1:1\)
3. \(1:5\)
4. \(1:4\)
1. \(1:2\)
2. \(1:1\)
3. \(1:5\)
4. \(1:4\)
Subtopic: Einstein's Photoelectric Equation |
77%
From NCERT
AIPMT - 2011
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In an experiment of the photoelectric effect, the wavelength of incident radiation is . The wavelength of incident radiation is reduced to rd of initial value and the maximum kinetic energy of photoelectron is observed to be n times the previous value. What will be the threshold wavelength for the metal plate?
| 1. | \(\dfrac{n-1}{n-3} \lambda \) | 2. | \(\dfrac{n}{n-3} \lambda \) |
| 3. | \(\dfrac{n-3}{n-1} \lambda \) | 4. | \(\dfrac{n+1}{n-3} \lambda\) |
Subtopic: Einstein's Photoelectric Equation |
72%
From NCERT
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A photosensitive metallic surface has a work function of \(h\nu_0\). If photons of energy \(2h\nu_0\) fall on this surface, the electrons come out with a maximum velocity of \(4\times10^{6}\) m/s. When the photon energy is increased to \(5h\nu_0\), then the maximum velocity of photoelectrons will be:
1. \(2\times 10^7~\text{m/s}\)
2. \(2\times 10^6~\text{m/s}\)
3. \(8\times 10^5~\text{m/s}\)
4. \(8\times 10^6~\text{m/s}\)
1. \(2\times 10^7~\text{m/s}\)
2. \(2\times 10^6~\text{m/s}\)
3. \(8\times 10^5~\text{m/s}\)
4. \(8\times 10^6~\text{m/s}\)
Subtopic: Einstein's Photoelectric Equation |
80%
From NCERT
AIPMT - 2005
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