In massive stars, three helium nuclei fuse together, forming a carbon nucleus. This reaction heats the core of the star. The net mass of the three helium nuclei must therefore be
A) less than that of the carbon nucleus.
B) the same as that of the carbon nucleus since mass is always conserved.
C) the same as that of the carbon nucleus since energy is always conserved.
D) higher than that of the carbon nucleus.
D
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Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with Glider B that has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision wil
A) 1/4 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 1 m/s. E) none of the above
How many electron states in the H atom have n=4 and l=2?
A. 10 B. 5 C. 3 D. 9 E. 18 F. 6
What is spacetime?
A) Time that we measure when traveling in space. B) It's a graph with four axes. C) It is a way of viewing books at different angles. D) The inseparable combination of space and time.
A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm b. 0.139 nm c. 0.0695 nm d. 1.02 × 10^?10 m e. 3.47 × 10^?11 m