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CBSE Class 12 · 2012 · EM WavesVery Short Answer

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Name the physical quantity which remains the same for microwaves of wavelength 1 mm and ultraviolet radiation of wavelength in vacuum.

Answer: Their speed in vacuum, m/s.

Solution

All electromagnetic waves, whatever their wavelength or frequency, travel through vacuum with the same speed m/s.
Hence the quantity common to both radiations is their speed.

CBSE Class 12 Board · 2012 · Subjective

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