1. Which example represents an inertial frame of reference for measuring all motion?

(a) a railway car that moves uniformly at half the speed of light

(b) the surface of Earth

(c) the surface of the Sun

d) the frame of reference in which the distant stars are not moving

2. In Einstein's well-known formula, E = mc2, m is the rest mass of a particle, c is the speed of light, and E is the

(a) classical kinetic energy of the particle

(b) relativistic kinetic energy of the particle

(c) rest energy of the particle

(d) potential energy of the particle

3. The word quantum in quantum mechanics means

(a) fast-moving

(b) a small amount of energy

c) a wave

(d) a particle

4. The energy of a photon is E. The energy of another photon is 2E. What is the speed of thehigher-energy photon?

a) c/2

b) c

c) 2c

d) 2c

5. A scientist shines green light on a copper plate in an attempt to demonstrate the photoelectric effect. However, no electrons are ejected. What type of light should the experimenter try next?

(a) infrared

(b) orange

(c) yellow

(d) blue

6. Which of these technologies is only possible due to our understanding of quantummechanics?

(a) a laser barcode scanner

(b) radar

(c) hydroelectric power

(d) rocket engines