A paint pigment that absorbs blue light and gives off red light
A) is fluorescent.
B) is phosphorescent.
C) can be both of these
D) neither of these
Answer: C
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There are no X-ray telescopes on Earth because:
A) they are too expensive to build. B) no one has yet invented an X-ray telescope that works. C) we can't figure out how to direct an X-ray beam through space. D) X-rays don't penetrate Earth's atmosphere. E) there are no astronomical objects that emit X-rays.
If the mass of a 1.0 kg book could be entirely converted into electrical energy, how many Kw-h would that generate?
What will be an ideal response?
If Planck's constant were ten times smaller than it is, quantum effects would be
A) easier to detect. B) more difficult to detect. C) neither easier nor more difficult to detect.
Suppose the ends of a 30-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The beam has a cross-sectional area of 30 cm2. What force against the clamps does the beam exert when it is heated to 40°C? (?Steel = 1.1 × 10?5/°C, Ysteel = 20 × 1010 N/m2).
What will be an ideal response?