If c is the velocity of light in free space, the correct statements about photons among the following are:

(A) The energy of a photon is E=hν.
(B) The velocity of a photon is c.
(C) The momentum of a photon, p=hνc.
(D) In a photon-electron collision, both total energy and total momentum are conserved.
(E) Photon possesses a positive electric charge.
Choose the correct answer from the options given below:
1. (A), (B), (C) and (D) only
2. (A), (C) and (D) only
3. (A), (B), (D) and (E) only
4. (A) and (B) only
Subtopic:  Particle Nature of Light |
 63%
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NEET - 2024
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The graph that shows the variation of 1λ2 with the kinetic energy E (where λ is the de-Broglie wavelength of a free particle) is:
1. 2.
3. 4.
Subtopic:  De-broglie Wavelength |
 57%
From NCERT
NEET - 2024
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Radiation of wavelength 280 nm is used in an experiment of photoelectric effect with cathode of work function, 2.5 eV. The maximum kinetic energy of the photoelectrons is:
[Take h=6.62×1034 J s and c=3×108 ms1]
1. 4.4 eV 2. 7.103×1015 J
3. 1.9 eV 4. 4.60 eV
Subtopic:  Einstein's Photoelectric Equation |
 78%
From NCERT
NEET - 2024
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Given below are two statements:
Statement I: The de Broglie wavelength associated with a material particle depends on its charge and nature.
Statement II: The wave nature of particles in sub-atomic domain is significant and measurable.
 
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.
Subtopic:  De-broglie Wavelength |
From NCERT
NEET - 2024
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An electron and an alpha particle are accelerated by the same potential difference. Let λe and λα denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:
1. λe>λα
2. λe=4λα
3. λe=λα
4. λe<λα
Subtopic:  De-broglie Wavelength |
 70%
From NCERT
NEET - 2024
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If ϕ is the work function of photosensitive material in electron-volts and light of a wavelength of numerical value λ=hce metres is incident on it with energy above its threshold value at an instant, then the maximum kinetic energy of the photo-electron ejected by it at that instant is (in SI units): 
(take h as Plank's constant and c as the velocity of light in free space)
1. e+2ϕ
2. 2eϕ
3. eϕ
4. e+ϕ
Subtopic:  Einstein's Photoelectric Equation |
 82%
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NEET - 2024
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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 |
 67%
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 |
 56%
From NCERT
NEET - 2023
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The maximum kinetic energy of the emitted photoelectrons in the photoelectric effect is independent of the:

1. work function of material
2. intensity of incident radiation
3. frequency of incident radiation
4. wavelength of incident radiation
Subtopic:  Photoelectric Effect: Experiment |
 78%
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NEET - 2023
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When two monochromatic lights of frequency, ν and ν2 are incident on a photoelectric metal, their stopping potential becomes Vs2 and Vs, respectively. The threshold frequency for this metal is:
1. 32ν 2. 2ν
3. 3ν 4. 23ν
Subtopic:  Einstein's Photoelectric Equation |
 70%
From NCERT
NEET - 2022
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