Which of the following properties describes a low-mass star?
A) ends its life as a supernova
B) late in life, fuses carbon into oxygen
C) has longer lifetimes than high mass stars
D) has higher main-sequence luminosities than high mass stars
C
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Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
A) Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons. B) Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons. C) Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation. D) Greater. The mass of the atomic nucleus also has mass of the "atomic glue" that holds the nucleons together in the nucleus.
A neutron bouncing off a heavy nucleus loses speed. If it instead bounces off a light nucleus it loses
A) less speed. B) more speed. C) the same amount of speed.
Calculate the radius that a loop should have so that the magnetic energy density at its center is equal to 6 mJ/ m3 when a current I = 20A passes through the loop?
A) 26 cm B) 10 cm C) 7 cm D) 18 cm E) 15 cm
When a colored light in air shines on water and is refracted, its frequency
A) decreases. B) remains unchanged. C) increases.