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

Physics & Space Science

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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.

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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?

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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?

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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.

Physics & Space Science