Qstnid -3- What Physical Quantity Is The Same For X-rays Of Wavelength 10<sup>-10</sup> M, Red Light Of Wavelength 6800 Å And Radiowaves Of Wavelength 500 M? - 08: Electromagnetic Waves

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#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?

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