Which of these has a higher frequency than visible light?
A) radio wave
B) microwave
C) infrared wave
D) ultraviolet wave
E) all do
Answer: D
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Scientists have proved that an asteroid or comet impact approximately 65 million years ago caused the extinction of the dinosaurs
Indicate whether the statement is true or false
A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
A. 60 kJ B. 45 kJ C. 75 kJ D. 90 kJ E. 230 kJ
Why are collisions between galaxies more likely than collisions between stars within a galaxy?
A) Galaxies have higher redshifts than stars. B) Galaxies travel through space much faster than stars. C) Galaxies are much larger than stars. D) Relative to their sizes, galaxies are closer together than stars.
The efficiency of a heat engine
a. can never exceed the Carnot efficiency. b. can be improved by lowering the temperature of the cool reservoir. c. can be improved by raising the temperature of the hot reservoir. d. all of the above