If c is the velocity of light in free space, the correct statements about photon among the following are : A. The energy of a photon is E = hv. B. The velocity of a photon is c. C. The momentum of a photon, p = hv/c. D. In a photon-electron collision, both total energy and total momentum are conserved. E. Photon possesses positive charge. Choose the correct answer from the options given below :

The correct answer is Option 1. Full mathematical solution steps and hints are accessible in the interactive StemCET workspace.

Physics Q16 – NEET-UG 2024

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Home Physics Dual Nature of MatterQuestion #80

c

is the velocity of light in free space, the correct statements about photon among the following are : A. The energy of a photon is

E = h ν

. B. The velocity of a photon is

c

. C. The momentum of a photon,

p = \frac{h ν}{c}

. D. In a photon-electron collision, both total energy and total momentum are conserved. E. Photon possesses positive charge. Choose the correct answer from the options given below :

Clue 1 of 3: Fundamental Properties of Photons

Recall the basic characteristics of a photon, including its energy, momentum, velocity, and charge.

🧠 Full Solution Path

Step 1: Evaluate Statements A, B, and E (Basic Photon Properties)✦ Active

Statement A: The energy of a photon is given by Planck's equation, $E = h ν$ , where $h$ is Planck's constant and $ν$ is the frequency. This statement is correct.

Statement B: Photons are massless particles that always travel at the speed of light $c$ in a vacuum. This statement is correct.

Statement E: Photons are electrically neutral particles and do not possess any charge. Therefore, this statement is incorrect.

Step 2: Evaluate Statements C and D (Photon Momentum and Collisions)○ Expand

Statement C: For a massless particle like a photon, the energy-momentum relation is $E = p c$ . Substituting $E = h ν$ , we get $h ν = p c$ , which implies the momentum $p = \frac{h ν}{c}$ . This statement is correct.

Statement D: In any collision, including a photon-electron collision (e.g., Compton scattering), the total energy and total momentum of the system are always conserved. This is a fundamental principle of physics and is correct.

💡 Teacher's Secret Hint

Remember that conservation laws apply to the entire system, not necessarily individual particles, though for photons, their properties are well-defined.

Step 3: Identify the Correct Option○ Expand

Based on the evaluation, statements A, B, C, and D are correct, while statement E is incorrect. Therefore, the correct combination of statements is A, B, C, and D.

Comparing this with the given options, option (1) 'A, B, C and D only' matches our findings.

💡 Teacher's Secret Hint

Always evaluate each statement independently before combining them to avoid errors.

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Physics Question 16 – NEET-UG 2024

Clue 1 of 3: Fundamental Properties of Photons

🧠 Full Solution Path