The luminosity of light emerging from the star's gaseous surface is equal to the
A) rate of energy generated from nuclear reactions in the star's core.
B) mass of the star.
C) star's apparent brightness.
D) star's lifetime.
E) temperature of the star's core.
A
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Which method of astronomical measurement is the precise measurement of brightness?
A) spectroscopy B) photography C) astrometry D) photometry E) interferometry
In a completely filled atomic shell,
a. the intrinsic spin of the electrons does not produce a resultant magnetic moment. b. the orbital motion of the electrons does not produce a resultant magnetic moment. c. the atom will be an alkali metal. d. only (a) and (b) are correct. e. none of the above are correct.
Two hockey pucks are initially at rest on a horizontal plane of frictionless ice. Puck A has twice the mass of puck B. Suppose we exert a constant force on puck A until it has travelled 2 m from its starting position. We exert a force of the same magnitude on puck B until it has travelled 1 m from its starting position. How do the pucks’ kinetic energies compare when we stop pushing them?
A. KA = 4KB B. KA = 2KB C. KA = KB D. KB = 2KA E. KB = 4KA F. Some other relationship (specify)
Ernest Rutherford
A) observed back-scattering from nuclei. B) discovered radium and polonium. C) proposed the tiny central nucleus idea. D) invented the particle detector tube. E) proposed the plum-pudding model.