## Which of the following statements are true concerning light? Choose all that apply.

Question

### Question:

What is the formula weight of MG(NO3)2?

(a) The speed of light in matter is less than the speed of light in a vacuum.

(b) Its propagation direction is parallel to both the electric field and the magnetic field.

(c) The speed of light in matter is greater than the speed of light in a vacuum.

(d) Its propagation direction is perpendicular to both the electric field and the magnetic field.

(e) It moves at a constant speed through the vacuum.

(f) The speed of light is the same no matter what material it is traveling through

a) TRUE
The speed of light is maximum in vacuum, and its value get decreased by the electric and magnetic properties of the matter.
b) FALSE
The magnetic field oscillates in phase with the electric field. The electric field is always perpendicular to the magnetic field, and both fields are directed at right-angles to the direction of propagation of the wave. In fact, the light wave propagates in the direction.
c) TRUE
The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph
Light is slowed down in transparent media such as air, water and glass
d) TRUE
The electric field is always perpendicular to the magnetic field, and both fields are directed at right-angles to the direction of propagation of the light wave.
e) TRUE
The speed of light is constant in the vacuum since astronomers usually don’t have to consider the speed of light in different media
f) FALSE
Light is slowed down in transparent media such as air, water and glass. The ratio by which it is slowed is called the refractive index of the medium and is always greater than one. This was discovered by Jean Foucault in 1850.

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