Physics Alternating Current ETEA 2016
PMDC Verified Question 99 of 127
Which of the following are also called heat radiations?
A
Visible light
B
Radio waves
C
Microwaves
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 D: Infrared rays
Concept:

Infrared radiation is readily absorbed by molecular vibrational modes in matter, causing an increase in thermal kinetic energy and temperature.

Formula / Reaction:

$$\lambda_{\text{IR}} \approx 700\text{ nm to } 1\text{ mm}$$

Solution:

  • Warm objects emit electromagnetic radiation predominantly in the infrared band.


  • Because its absorption produces noticeable heating in objects and biological tissue, infrared radiation is commonly termed heat radiation.


Why other options are incorrect:

  • Opt_A: Visible light stimulates human vision.


  • Opt_B: Radio waves are used for communication.


  • Opt_C: Microwaves are used in radar and dielectric heating.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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