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Q. No.

A photon of energy \(3.4\) eV is incident on a metal having a work function of \(2\) eV. The maximum K.E of photo-electrons is equal to:
1. \(1.4\) eV 2. \(1.7\) eV
3. \(5.4\) eV 4. \(6.8\) eV
Q1:
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Subtopic:  Einstein's Photoelectric Equation |
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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. \(\sqrt{\dfrac{h\nu}{2m}}\)
Q2:
 83% From NCERT AIPMT - 2013
Subtopic:  Einstein's Photoelectric Equation |
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When monochromatic photons of wavelength \(4000~\mathring{A}\) are incident on the metal plate of work function \(2.1\) eV, what will be the stopping potential for the photocurrent?
1. \(1\) V 2. \(2.1\) V
3. \(3.1\) V 4. Zero
Q3:
 81% From NCERT 
Subtopic:  Einstein's Photoelectric Equation |
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The correct graph between the maximum energy of a photoelectron \(\left(K_{max}\right)\) and the inverse of the wavelength \(\left(\dfrac{1}{\lambda}\right)\) of the incident radiation is given by the curve:

          

1. \(A\) 2. \(B\)
3. \(C\) 4. None of these
Q4:
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Subtopic:  Einstein's Photoelectric Equation |
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The work function of a metal surface is \(\phi = 1.5\) eV. If a light of wavelength \(5000~\mathring{A}\) falls on it, then the maximum K.E of the ejected electron will be:
1. \(1.2\) eV 2. \(0.98\) eV
3. \(0.45\) eV 4. \(0\) eV
Q5:
 80% From NCERT AIPMT - 1998
Subtopic:  Einstein's Photoelectric Equation |
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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. \(\dfrac{\lambda}{6}\)
Q6:
 77% From NCERT NEET - 2015
Subtopic:  Einstein's Photoelectric Equation |
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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

Q7:
 78% From NCERT AIPMT - 2005
Subtopic:  Einstein's Photoelectric Equation |
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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. \(8\times 10^6~\text{m/s}\)

Q8:
 78% From NCERT AIPMT - 2005
Subtopic:  Einstein's Photoelectric Equation |
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A metallic surface is exposed to two radiations separately, one of wavelength \(4000~\mathring{A}\) and the other of \(8000~\mathring{A}\). If the work function of metal is \(1\) eV, then the ratio of maximum kinetic energies of photoelectrons is nearly equal to:
1. \(\dfrac{32}{11} \) 2. \(\dfrac{42}{11} \)
3. \(\dfrac{52}{11} \) 4. \(\dfrac{62}{11}\)
Q9:
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Subtopic:  Einstein's Photoelectric Equation |
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The photosensitive material's work function is \(4.0\) eV. The longest wavelength of light that can cause a substance's photoelectric emission is approximately:
1. \(3100\) nm
2. \(966\) nm
3. \(31\) nm
4. \(310\) nm

Q10:
 75% From NCERT NEET - 2019
Subtopic:  Einstein's Photoelectric Equation |
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