In alpha decay, the Q-value and the kinetic energy of the alpha particle
A)
have no trend in the relative size.
B)
are different with the Q-value larger.
C)
are different with the kinetic energy larger.
D)
are the same.
E)
cannot be determined.
B
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The energy per gallon of liquid hydrogen, compared to gasoline, is about
A. 3x less B. about the same C. 3x more D. 12x more
The age of a star cluster can be determined from the ____________________ of the cluster
Fill in the blank(s) with correct word
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.
The outward pressure of hot gas in the Sun
A) is balanced by the inward gravitational pressure. B) is increasing the Sun's diameter. C) is cooling the photosphere. D) is responsible for variations in the sunspot cycle. E) weakens the magnetic field.