Quasars ____
a. are common at all ages of the Universe
b. are the early stages of what become Seyfert galaxies
c. disrupt galactic formation and become isolated black holes
d. are an early stage of the formation of common galaxies
e. are formed from double-lobed radio galaxies
d
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Who discovered the electron in 1897?
a. Dalton b. Bohr c. Rutherford d. Thomson
What is the purpose of the lens in an eye?
A) to bend light entering the eye so that it is focused onto the retina B) to collect light to send to the brain to be interpreted C) to interpret the light collected by the eye as colors D) to adjust the amount of light entering the eye so it is not too much or too little E) to determine what color the eye will be
When work is done by a force on an object, then which of the following is true?
A. The work done is equal to the change of total kinetic energy of the object plus any energy appearing as heat, light, or sound B. The object does an equal amount of work on the force C. The object must change height above the ground D. The force cannot take energy away from the object E. The speed of the object must change
What is the principal difference between a hydrogen bomb and a uranium bomb?
A) A uranium bomb is an atomic bomb, and a hydrogen bomb is a nuclear bomb. B) A uranium bomb utilizes a fission reaction whereas a hydrogen bomb utilizes a fusion reaction. C) Both work on the same principle, but the hydrogen bomb has a higher yield. D) A hydrogen bomb converts mass into energy, whereas a uranium bomb does not. E) One results in radioactive fallout, and the other does not.