When an electron collides with a positron the two particles
A) fuse to form a heavier particle
B) bounce off each other
C) are destroyed, producing a pair of high-energy gamma rays
D) are destroyed, producing another pair of particles
C
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Centrifuge separation, a method of separating 235U from 238U, works because of
A) the difference in size of the two nuclei. B) the fact that both these nuclei are radioactive. C) the difference in the masses of the two nuclei. D) the difference in electrical charge of the two nuclei. E) the fact that both these nuclei respond to (or feel) the strong nuclear force.
Answer the following statement(s) true (T) or false (F)
1. In the situation described in problem R4T.4, the train passengers are moving, but Rob is at rest. Therefore, the train passengers measure less time between the events than Rob does 2. The coordinate time between two given events is shortest in the inertial frame where their spatial separation is the smallest.
Part AIo experiences tidal heating primarily because __________.
a. its elliptical orbit causes the tidal force to vary as Io orbits Jupiter. b. it is located very close to Jupiter. c. it is made of relatively soft materials that deform quite easily. d. it has an elongated shape that makes it look more like an egg than a sphere.
To estimate the central temperature of the Sun, scientists
A) send probes to measure the temperature. B) use hot gas to create a small Sun in a laboratory. C) monitor changes in Earth's atmosphere. D) use computer models to predict interior conditions.