Question

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

Answer 1

The physical quantity speed is same for X-ray, red light and radio waves in vacuum and is c = 3 × 108 ms-1.

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Answer 2

The speed of light (3 × 108 m/s) in a vacuum is the same for all wavelengths.