what happens to the incoming solar radiation after it is reflected off the surface of the earth the wavelength is longer it speeds up it slows down the wavelength is stronger

When incoming solar radiation is reflected off the surface of the Earth, the wavelength remains the same as it was before reflection; it does not get longer, nor does the radiation speed up, slow down, or become stronger in terms of wavelength. The change that can occur is a phenomenon called "albedo," where the energy is distributed back into the atmosphere and space but the physical properties of the light such as wavelength and speed remain consistent with the behavior of light.

To clarify the possibilities you mentioned:

- The wavelength is longer: This is not caused by reflection but can occur when light passes through certain media (like the atmosphere in a process called scattering) or when light is absorbed and re-emitted at a different wavelength, which can happen in the process of thermal radiation emitted by Earth. - It speeds up: The speed of light in a vacuum is constant (approximately 299,792 kilometers per second). When light moves from one medium to another, its speed can change if the optical density is different, but reflection off the Earth’s surface doesn't change the medium, so the light's speed remains the same. - It slows down: As above, reflection does not cause light to slow down. - The wavelength is stronger: The term "stronger" is not technically accurate when describing a wavelength. We could discuss the intensity or amplitude of reflected light, which might be diminished due to absorption by the surface or the atmosphere, but this does not affect the wavelength.