As seen from the Earth's southern hemisphere, the celestial equator passes
a. north of overhead.
b. south of overhead.
c. through the north celestial pole.
d. through the south celestial pole.
a
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What power (in diopters) of corrective lens is required to correct the vision of a myopic eye whose far point is at 170 cm?
What will be an ideal response?
Percival Lowell’s claims of a Martian civilization generated great public interest, but other scientists of his time were highly skeptical of these claims. Which two of the following statements (which are all true) explain why other scientists of the late 19th and early 20th centuries rejected Lowell’s claims?
a. Lowell’s canals did not appear in photographs of Mars taken through telescopes. b. Lowell’s canals followed perfectly straight lines for thousands of kilometers. c. Mars has an axis tilt very similar to Earth’s axis tilt. d. Like Earth, Mars has polar ice caps. e. Mars rotates with a period only a little longer than Earth’s rotation period.
When white light passes through a cool cloud of gas, we see
A) visible light. B) infrared light. C) thermal radiation. D) an absorption line spectrum. E) an emission line spectrum.
Most of the liquid hydrocarbons on Titan are concentrated in
A) lakes B) surface oceans C) subsurface oceans D) ponds