When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of
A) hydrogen.
B) helium.
C) lithium.
D) carbon.
E) none of the above
Answer: B
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Thermodynamic Processes: The process shown on the pV diagram in the figure is an
A. adiabatic expansion. B. isothermal expansion. C. isometric expansion. D. isobaric expansion.
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8.0 cm. The final image
A) is virtual and upright. B) is real and upright. C) is virtual and inverted. D) is real and inverted. E) cannot be determined with the information given.
You observe a star similar to our own Sun in size and mass. This star moves slightly back and forth in the sky once every 4 months, and you attribute this motion to the effect of an orbiting planet. What can you conclude about the orbiting planet?
A) The planet must be closer to the star than Earth is to the Sun. B) The planet must have a mass about the same as the mass of Jupiter. C) The planet must be farther from the star than Neptune is from the Sun. D) You do not have enough information to say anything at all about the planet.
What is the CNO cycle?
A) a set of steps by which four hydrogen nuclei fuse into one helium nucleus B) the process by which helium is fused into carbon, nitrogen, and oxygen C) the process by which carbon is fused into nitrogen and oxygen D) the set of fusion reactions that have produced all the carbon, nitrogen, and oxygen in the universe