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Q1 Yes. Q2 No.
And perhaps suprisingly radio waves will travel faster in the atmosphere compared to light.
It's based on Rayleigh scattering where scattering of a photon is a function of its wavelength. The shorter the wavelength, the greater the scattering and energy loss of the photon by atmospheric molecules.
Radio waves have much longer wavelengths than light.
It explains why the sky is blue.
Regards
Steven
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