An alternate version of the uncertainty principle exchanges the uncertainties in position and momentum with uncertainties in __________ and time interval.
A. angular momentum
B. charge
C. angle
D. energy
E. wavelength
D. energy
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How do we think the first generation of stars would have been different from stars born today?
A) They would have lacked elements heavier than hydrogen and helium. B) They would have generated energy through fission rather than fusion. C) They would have all been very low in mass. D) They would have shined only with ultraviolet light, not visible light.
Two speakers in an automobile emit sound waves that are in phase at the speakers. One speaker is 40 cm ahead of and 30 cm to the left of the driver's left ear. The other speaker is 50 cm ahead of and 120 cm to the right of the driver's right ear. Which of the following wavelengths is(are) in phase at the left ear for the speaker on the left and the right ear for the speaker on the right?
A. 10 cm B. 20 cm C. 650 cm D. All of the wavelengths listed above. E. Only the wavelengths listed in (a) and (b).
The binding energy of a nucleus is equal to
a. the energy needed to remove one of the nucleons. b. the average energy with which any nucleon is bound in the nucleus. c. the energy needed to separate all the nucleons from each other. d. the mass of the nucleus times c2.
Light is without mass, so how can gravity have an effect on light?
A) The space through which the light passes is curved. B) Photons actually have a very small mass, so gravity does have an effect on them. C) When light interacts with particles, it loses some energy, and thus takes on some mass. D) Gravity has no effect on light.