How Does Light Travel?

Answer Light is waves of energy that travel at 300,000 km per second. The speed of light can be slowed down depending on what it is passing through.

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Top Q&A For: How Does Light Travel

Does light have mass If so, then how can it travel at the speed of light Doesn't the mass of an object (particle) approach infinity as its velocity approaches the speed of light?

Light has precisely zero mass and that makes all the difference. You're right that taking a massive particle up to the speed of light is impossible because doing so would, in a certain sense, give ... Read More »

Why does light travel slower in some media than in a vacuum For example, in glass or other transparent media, visible light is not absorbed and yet it slows down. What's going on — FH, Waltham, MA?

When a light wave enters matter, the light wave's electric field causes charged particles in the matter to accelerate back and forth. That's because an electric field exerts forces on charged parti... Read More »

You insist over and over again that it is impossible to go faster than the speed of light. This is completely and entirely untrue. Tachyons travel faster than light. They also go faster as they exert less and less energy. — K?

I'm afraid that you confuse the hypothetical with the actual. While people have hypothesized about superluminal particles called tachyons, they have never been observed and probably don't exist. Th... Read More »

Can light be bent by electric fields, magnetic fields, and gravity fields If so, can these fields be made to make light travel in a circle — RS?

Light consists of electromagnetic waves, meaning that it is composed of electric and magnetic fields. While light isn't affected by other electric or magnetic fields, it is affected by gravitationa... Read More »