In both fission of uranium and fusion of hydrogen, mass
A) decreases.
B) remains constant.
C) increases.
Answer: A
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A carbon nanotube is a single sheet of ______________rolled into a tube.
Fill in the blank(s) with the appropriate word(s).
When a source of sound approaches, measurements will show an increase in the sound's
1) speed, 2) frequency, 3) wavelength, 4) all of these, 5) none of these, and when a source of sound recedes, measurements will show an increase in the sound's 6) speed. 7) frequency. 8) wavelength. 9) all of these. 10) none of these.
Star A is identical to Star B, but Star A is twice as far from us as Star B. Therefore
A) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A. B) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. C) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. D) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B.
What is the Asteroid belt?
A. a line of craters on the Moon caused by an asteroidal impact about 50 million years ago B. the place in the Solar System where most of the asteroids are found C. a line of craters on Earth caused by an asteroidal impact about 50 million years ago D. a term used to describe the impact of a very large asteroid with a planet E. None of these choices is correct.