Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

According to photon picture of electromagnetic radiation, which of the following statements is incorrect?

Options:

Each photon has energy and momentum.

Each photon moves with speed of light in vacuum.

Photons are electrically neutral.

In a photon-electron collision, the total energy and total momentum are not conserved.

Correct Answer:

In a photon-electron collision, the total energy and total momentum are not conserved.

Explanation:

Features of the photons:
(i) Photon are particles of light having energy E=hv and momentum  p=h/λ, where h is Planck constant.
(ii) Photons travel with the speed of light in vacuum, independent of the frame of reference.
(iii) Intensity of light depends on the number of photons crossing unit area in a unit time.

(iv)Photons are electrically neutral.