What is cosmic background radiation evidence for?
a. Dark matter.
b. Dark energy.
c. The Big Bang theory.
d. The theory of relativity.
e. Neutrino oscillations.
c
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Which of the following rocks is a sedimentary rock?
a. Slate b. Granite c. Marble d. Conglomerate
How many possible substates are available in a hydrogen atom where the principal quantum number is 2?
a. 18 c. 36 b. 8 d. 9
Everything looks red through a red filter because
A) the filter emits red light and absorbs other colors. B) the filter absorbs red light and emits other colors. C) the filter transmits red light and absorbs other colors. D) the filter reflects red light and transmits other colors.
A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
A. 94 lb B. 88 lb C. 63 lb D. 75 lb E. 150 lb