Answer is Option C Lumen.It is also known as luminous energy.
Answer:
Two of Einstein’s influential ideas introduced in 1905 were the theory of special relativity and the concept of a light quantum, which we now call a photon. Beyond 1905, Einstein went further to suggest that freely propagating electromagnetic waves consisted of photons that are particles of light in the same sense that electrons or other massive particles are particles of matter. A beam of monochromatic light of wavelength \lambda (or equivalently, of frequency f) can be seen either as a classical wave or as a collection of photons that travel in a vacuum with one speed, c (the speed of light), and all carrying the same energy, {E}_{f}=hf. This idea proved useful for explaining the interactions of light with particles of matter.
<span>harnessing the sun's energy to produce heat or electricity is : Non-polluting
Unlike oil or gas based energy, solar energy create no dangerous emission that is dangerous for our environment.
Many scientist believed that solar energy is the answer to the environmental crisis that we currently faced.</span>
Gravity affet everything and it touches nothing.
Hope this helps!
