Question

Question #fafb1

Answer 1

The answer is (a)

Explanation:

Photons are electromagnetic radiation (EMR). All EMR travels at the same speed, the speed of light. Hence it is independent of wavelength or amplitude.

Equally the source does not matter, even if the source is moving towards or away from you, so it is not (d) . This is actually quite bizarre when you think about it....if you were driving at 30mph and car "A" passed you in the same direction at 40mph, from your frame of reference car "A" would be driving at 10mph, and a person standing on the side of the road would say car "A" was travelling at 40mph (and you would both be right in your frames of reference).

However, if car "A" was a photon, both you and the person at the side of the road would both agree the photon was travelling at the speed of light (`3times 10^8ms^-1`). This very counterintuitive result led to Einstein developing his theory of relativity.