The separation of red and blue light in single-lens telescopes is called ________ aberration
Fill in the blank(s) with correct word
chromatic
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When ultraviolet light is incident upon glass, atoms in the glass
A) are forced into vibration. B) resonate. C) pass the light energy along practically undiminished. D) freely absorb and re-emit most of the ultraviolet light.
The total energy radiated by a blackbody depends on:
A) the fourth power of its temperature. B) the square of its temperature. C) the square root of its temperature. D) the cube root of its temperature. E) the cube of its temperature.
A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose that such a wall, fabricated from 20-cm-thick solid concrete blocks (k = 0.13 W/(mK), ? = 0.05 × 10–5 m2/s) is initially at 15°C in equilibrium with the room in which it is located. It is suddenly exposed to sunlight and absorbs 500 W/m2 on the exposed face. The exposed face loses heat by radiation and convection to the outside ambient temperature of –15°C through a combined heat transfer coefficient of 10 W/(m2 K). The other face of the wall is exposed to the room air through a heat transfer coefficient of 10 W/(m2 K). Assuming that the room air temperature does not change, determine the maximum temperature in the wall after 4 hours of exposure and the net heat transferred to the room.
GIVEN • Trombe wall suddenly exposed to sunlight FIND (a) Maximum temperature in the wall after 4 hours (b) Heat input to the room
Scientists are confident that the Moon does not have a large, dense nickel-iron core because
A) the Moon's surface rocks are similar in density to the Moon's average density. B) deep samples taken by the Apollo astronauts found almost no iron. C) the Earth's magnetic field would pull anything with a lot of iron into the Earth. D) unmanned Soviet missions drilled into the Moon's core and did not find iron. E) a thick atmosphere is required for there to be a metal core.