Which of the following stars are brightest at ultraviolet wavelengths?
A) G and K stars
B) M stars
C) A and F stars
D) O and B stars
E) None; all stars are brightest at optical wavelengths.
D
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A 10th magnitude star is ________ than a 5th magnitude star.
A. 2 times fainter B. 100 times fainter C. 2 times brighter D. 100 times brighter
Visible sunspots lie in the
A) chromosphere. B) transition zone. C) corona. D) radiative zone. E) granulation in the photosphere.
The positron was first predicted by
A) Einstein. B) Planck. C) Elvis Presley. D) Dirac. E) Heisenberg.
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of the special relativistic effect of __________
Fill in the blank(s) with correct word