If a radionuclide has a half-life of 8 h, ______________ half-lives would go by during 40 h
Fill in the blank(s) with correct word
5
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To a large degree, the ________ has replaced photographic film for astronomical imaging
Fill in the blank(s) with correct word
Which of the following explains why we see different constellations at different times of year?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
Convex (converging) lenses are worn by
A. a nearsighted person to make rays from a nearby object diverge less strongly. B. a farsighted person to make rays from a distant object diverge more strongly. C. a farsighted person to make rays from a nearby object diverge less strongly. D. a nearsighted person to make rays from a distant object diverge more strongly.
What is the approximate latitude of the observer in the diagram below?
a.
20° N
b.
20° S
c.
70° N
d.
70° S
e.
0°