In reference to the radio waves, choose the incorrect statements:
(A) Radio waves are the longest wavelength electromagnetic waves.
(B) Radio waves are deviated by electric and magnetic fields.
(C) Radio waves are diffracted easily.
(D) Radio waves are not electromagnetic waves.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (B) and (D) only
Radio waves are the part of the electromagnetic spectrum with the longest wavelengths (from about 0.1 m up to kilometres). The question asks for the incorrect statements.
(A) Radio waves are the longest wavelength electromagnetic waves. — Correct statement. They lie at the long-wavelength end of the electromagnetic spectrum.
(B) Radio waves are deviated by electric and magnetic fields. — Incorrect statement. Electromagnetic waves carry no charge, so electric and magnetic fields do not deflect them.
(C) Radio waves are diffracted easily. — Correct statement. Diffraction is marked when the wavelength is comparable to the size of the obstacle, and radio wavelengths are comparable to buildings and hills.
(D) Radio waves are not electromagnetic waves. — Incorrect statement. They are electromagnetic waves, produced by accelerated charges in antennas.
NCERT (2026-27):
Summary – “… 6. 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.”