A region in the Universe where there are almost no galaxies is called a ________.
A. void
B. supermassive black hole
C. dark nebula
D. zone of avoidance
Answer: A
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What is the Oort cloud?
A) It's not really a cloud at all, but rather refers to the trillion or so comets thought to orbit the Sun at great distances. B) It is another name for the cloud of gas from which our solar system was born. C) It is a great cloud of gas that resides far beyond the orbit of Pluto. D) It is a giant storm in the atmosphere of Saturn.
Rank the following kinds of waves according to their frequencies from highest to lowest:
(a) gamma rays (b) microwaves (c) radio waves (d) visible light (e) x-rays
1.c > b > d > e > a 2.b > c > e > b > a 3.a > e > d > b > c 4.e = a = c = d = bAt what speed is the momentum of an object five times that found classically?
a. 0.894c b. 0.960c c. 0.980c d. 0.800c e. 0.999c
In a nuclear plant, 1017 J of energy is available from mass conversion. How much mass of fuel was lost to produce this energy? (c = 3.0 × 108 m/s)
A) 0.1 kg B) 1 kg C) 10 kg D) 100 kg