Which of the following statements about the cosmic background radiation is not true?
A) It has a temperature of about 3 degrees K above absolute zero.
B) It appears essentially the same in all directions (it is isotropic).
C) It had a much higher temperature in the past.
D) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies that formed within the first billion years of the Big Bang.
E) It was discovered by Penzias and Wilson in the mid-1960s.
D
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What is the average kinetic energy of an oxygen molecule in a gas with a temperature of 300K?
a. 
b. 
c. 
d. 
e. 
What is the magnitude of Earth's gravitational field at a distance equal to twice Earth's radius?
A. 20 N/kg B. 10 N/kg C. 5 N/kg D. 2.5 N/kg
Laser light of 589 nm wavelength is shown through parallel slits forming a series of maxima on a screen 4.20 m away. If the distance between the central maximum and the first order maximum is 1.67 cm, what is the slit separation?
a. 
b. 
c. 
d. 
e. 
According to the Rutherford model of the atom, most of the volume of an atom
a. is empty space. b. was occupied by the nucleus. c. contained positive charges. d. excluded electrons.