Arrange the following waves in the increasing order of their wavelengths
(A) Visible light waves
(B) Microwave waves
(C) Infrared waves
(D) AM radio waves
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (C), (B), (D)
In the electromagnetic spectrum, the wavelength increases from visible light through infrared and microwaves to radio waves.
(A) Visible light waves — about 400 to 700 nm
(C) Infrared waves — about 700 nm to 1 mm
(B) Microwave waves — about 1 mm to 0.3 m
(D) AM radio waves — hundreds of metres
The order of increasing wavelength is A, C, B, D.
NCERT (2026-27):
Summary – “… The spectrum of electromagnetic waves stretches, in principle, over an infinite range of wavelengths. Different regions are known by different names; γ-rays, X-rays, ultraviolet rays, visible rays, infrared rays, microwaves and radio waves in order of increasing wavelength from 10-2 Å or 10-12 m to 106 m.”