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19. You and your friend are in spaceships becoming increasingly far away from one another as you shine beams of light toward one another. The spaceships are getting further apart at a rate of 0.5 c and no one is accelerating. As a result of this motion a. you will see her light reaching you at a rate of 0.75 c and she will see your light approaching her at a rate of 0.75 c you will see her light reaching you at a rate of 0.5 c and she wil see your light approaching her at a rate of 0.5 c c. what your measure for the speed of light depends on is who is really moving and who is actually at rest, and only the person truly at rest will measure light properly d. the effects of time dilation and length contraction will make the speed of light impossible to measure properly for both of you (there will be no relation between your measurements) e. you will both measure the speed of light coming from the other spaceship to bec Which of the following statements about quantum theory is false? a. Photons do not have mass or momentum b. Moving particles containing mass also have wavelengths. c. Light exhibits both wave and particle properties d. Photons are packets of energy and have wavelengths. e. Some electrons are not released from metallic surfaces because the frequency of the 20. incident light is too low.

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Answer #1

19. E is correct.

relativity formula is applied taking one observer at rest and other moving with 0.5c velocity.

V=(u+v)/(1+vu/c2)

u=c and v=-0.5c

V=c

20.A

This statement is wrong. photons have momentum.

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