The process during which small nuclei combine to form larger ones is referred to as
A)
nuclear fission.
B)
nuclear fusion.
B
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Which of the following is true of the cosmic microwave background?
A) It is radiation that existed before the big bang. B) It appears to come from a blackbody. C) It is radiation present in the ultraviolet spectrum. D) It has a very small redshift of about 10.
The redshift due to the Doppler effect is caused by
A) sources of light moving toward the Solar System. B) sources of light moving away from the Solar System. C) sources of light obscured by interstellar dust. D) sources of light moving at right angles to the Solar System. E) an effect not yet believed to be understood.
Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
a. The charge that is at rest. b. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. c. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. d. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. e. All the charges above experience equal forces when released in the same magnetic field.
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A) He measured its parallax. B) He used Cepheid variables in the Andromeda Galaxy. C) He deduced it from its redshift. D) He used white dwarf supernovae in the Andromeda Galaxy.