Question

An astronaut is stationary in space. Which of these would have the greatest speed as observed by the astronaut?
A: a ray of visible light
B: a strong magnetic field
C: a high speed electrical charge
D:a longitudinal wave carrying sound

Answer 1

Hello!

The answer that makes most sense to me is option A.

~ Hope I helped! ~

Answer 2

Answer: A: a ray of visible light  

Explanation:

Light is an electromagnetic radiation. It can travel through vacuum as well as medium. The speed of light is maximum in vacuum i.e. 3 × 10⁸ m/s. From experiments, scientists know that nothing can exceed the speed of the light i.e this speed of light is the upper limit and o particle or wave can travel with speed greater than this. Thus, a ray of visible light would have the greatest speed when observed by an astronaut.