Why is a planet's thermosphere warm?
A) It absorbs x-rays.
B) It absorbs infrared light.
C) It absorbs visible light.
D) It contains greenhouse gases.
E) It absorbs ultraviolet light.
A) It absorbs x-rays.
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The stars in our sky twinkle in brightness and color because of
A) turbulence in the Earth's atmosphere. B) rapid changes in the brightness and colors of stars caused by changes in their spectra. C) light pollution. D) the bubbling and boiling of gases on the surfaces of stars.
The slope of a tangent line at a given time value on a position versus time graph gives
A) instantaneous velocity. B) average velocity. C) instantaneous acceleration. D) average acceleration E) none of the given answers.
For an isotope with a half-life of one day, at the end of three days the amount that remains is
A) none. B) one-half. C) one-quarter. D) one-eighth. E) none of the above
Doubling the potential difference across a length of copper wire causes what change to the drift speed of the charge carriers?
1.No change occurs since drift speed is constant for copper. 2.The drift speed halves. 3.The drift speed doubles. 4.The drift speed quadruples.