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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»

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.



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