What is the main difference between gravitational waves and electromagnetic waves?

a)Gravitational waves produce gravitational forces which are much weaker than electromagnetic forces.

b)Gravitational waves do not interfere, electromagnetic waves do

c)Electromagnetic waves travel at the speed of light. Gravitational waves do not travel at the speed of light.

d)Gravitational waves result from the acceleration of charges. Electromagnetic waves result from the acceleration of matter. e)Gravitational waves do not have a source. Electromagnetic waves have charges as the source.

How is time dilation explained in special relativity?

a)In special relativity, two observers - each with local synchronized clocks - will see the other's clock as running slower because of the path difference of the light from the two clocks.

b)All of these statements explain time dilation according to special relativity.

c)In special relativity, time dilation can be explained with only concept- the constancy of the speed of the light with respect to inertial reference frames. No other concept is necessary.

d)In special relativity, time dilation occurs because of the curvature of spacetime.

Why is the following statement wrong? "If energy is conserved, it must have the same value in every inertial reference system." a)The statement is actually not wrong. If energy is conserved, it must have the same value in every inertial reference system. b)It is wrong because energy is a quantity which obeys the Galilean principle of relativity.

c)It is wrong because conservation of energy is not a law of calculating values of energy. The law simply tells us that whatever energy we calculate, the amount will remain the same before and after.