An absorption _________is the sharp increase in absorption that occurs when the energy of a photon is sufficient to excite an electron from one energy level to another.
Fill in the blank(s) with the appropriate word(s).
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A pendulum swings through 10 cycles in 2 seconds. The frequency of the pendulum is
A. 5 Hz. B. 10 Hz. C. 0.1 Hz. D. 0.5 Hz. E. 2 Hz.
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.
When a body moves with uniform acceleration, the net force on it is zero
Indicate whether the statement is true or false
If the plane of the Earth's equator were not tilted with respect to the ecliptic plane,
a. the daylight period of Earth would be the same year-round. b. there would be no seasonal changes. c. Earth's poles would not experience six-month-long nights. d. All of the above.