In which layer of Earth's atmosphere is ultraviolet light absorbed?
A) exosphere
B) thermosphere
C) stratosphere
D) troposphere
C) stratosphere
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Thanks to interferometry, a properly spaced set of 10-meter radio telescopes can achieve the angular resolution of a single, 100-kilometer radio telescope.
a. Yes, but with much lower sensitivity than a single, 100- kilometer telescope. b. Yes, and the resulting interferometer will have exactly the same properties as a single, 100-kilometer telescope. c. No, interferometry only works over much smaller distances. d. No, the blurring effects of Earth’s atmosphere limit the achievable angular resolution.
When sound travels faster near the ground than above, bending of sound tends to be
A) upward. B) downward. C) to the left. D) to the right. E) none of the above
In July 2011, the Dawn probe entered orbit around
A) the comet Wild. B) the asteroid Ida. C) the asteroid Ceres. D) the asteroid Gaspra. E) the asteroid Vesta.
When five equal positive charges are uniformly spaced along the x-axis, the force on the next to last charge on the right is directed
A) to the right. B) possibly in the negative y-direction. C) zero. D) possibly in the positive y-direction. E) to the left.