Which statement about how light travels is true?

light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.

light waves need a medium to travel, and they travel at the same speed even if the light source is moving.

light waves can travel in a vacuum and will travel faster if the light source is moving forward.

light waves need a medium to travel, and they travel faster if the light source is moving forward.

The correct answer to the question is - A). Light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.

EXPLANATION:

Before going to answer this question, first we have to understand the fundamental postulate of quantum mechanics.

As per the fundamental postulate of quantum mechanics, the speed of light is always constant irrespective of the nature of frame of reference i.e speed of light is same both in inertial and non-inertial frame of reference. It is independent of the velocity of source also.

Again we know that light is an electromagnetic wave. Hence, it won't require any medium for its propagation. It can travel in space or vacuum also.

Hence, the correct option out of four options is that light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.