Question

Question 8.3: What physical quantity is the same for X-rays of wavelength 10 −10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?

Class 12 - Physics - Electromagnetic Waves Electromagnetic Waves Page-286

Answer 1

answer :- speed of light in vaccum.

The physical quantity is the same for X-rays of wavelength 10^ -10 m. red light of wavelength 6800 Å and radio waves of wavelength 500 m
as we know, speed of light in vacuum equals to 3×108 m/s. the speed of light in vacuum remains same for all wavelengths. This is because speed of light is independent of wavelength in the vacuum.

Answer 2

$\bigstar$ Solution:

The speed of light $(3 \times 10^{8} \: m/s)$  in a vacuum is the same for all wavelengths. It is independent of the wavelength in the vacuum.