Physics Alternating Current ETEA 2015
PMDC Verified Question 111 of 127
Which of the following is not an electromagnetic radiation?
A
X-rays
B
UV rays
C
Cathode rays
D
Infrared rays
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Cathode rays
Concept:

Electromagnetic radiations are massless photons propagating at the speed of light. Cathode rays are streams of material particles (electrons).

Formula / Reaction:

$$\text{Cathode rays} = \text{beam of electrons } (m_e = 9.11 \times 10^{-31}\text{ kg}, q = -e)$$

Solution:

  • Cathode rays possess mass, carry negative electric charge, and are deflected by electrostatic and magnetic fields.


  • X-rays, UV rays, and infrared rays are uncharged, massless electromagnetic waves.


Why other options are incorrect:

  • Opt_A, Opt_B, Opt_D: All are standard regions of the electromagnetic spectrum.

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