X-rays are similar to
A) alpha rays.
B) beta rays.
C) gamma rays.
D) all of the above
E) none of the above
Answer: C
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The polarization of light passing though the dust grains shows that:
A) the dust grains are elongated in shape. B) the dust grains are aligned by a weak interstellar magnetic field. C) the dust grains are chiefly made of iron. D) Both A and B are correct. E) All of the above are correct.
Compact fluorescent bulbs cost $10 per bulb and last 10 years. Tungsten bulbs cost $0.50 per bulb and last 1 year
For a given amount of light, a tungsten bulb draws 75 W and a compact fluorescent bulb draws 10 W. If the cost of electricity is $0.10/kWh and the bulbs are operated for 2000 h/yr, what amount of money is saved by use of a compact fluorescent instead of a tungsten bulb over a 20-year period?
A black hole consists of a large ________ in a small space.
Fill in the blank(s) with the appropriate word(s).
The most well-known impact crater in North America is
A) Crater Lake in Oregon B) Meteor Crater in Arizona C) Great Crater in Iowa D) Odessa Crater in Texas