The statements about light which are true are :
a. It can travel through empty space.
b. It has no mass.
c. It has moving electrons.
d. It’s made of moving electric and magnetic fields.
Explanation:
- Light waves can travel through matter, but light waves are different from water waves and sound waves.
- Light travels so fast that light emitted from the Sun travels 150 million km to Earth in only about eight and a half minutes.
- Light is composed of photons, which have no mass, so therefore light has no mass and can't weigh anything.
- Because photons have energy and as Einstein taught us, energy is equal to the mass of a body, multiplied by the speed of light squared.
- When an electron is hit by a photon of light, it absorbs the quanta of energy the photon was carrying and moves to a higher energy state.
- Electrons therefore have to jump around within the atom as they either gain or lose energy.
- Light is an oscillating electric and magnetic field, so it is electrical and magnetic.
- Light does not carry any charge itself, so it does not attract or repel charged particles like electrons
