How is it that absorption and reemission of radiation by carbon dioxide molecules can cause trapping of infrared radiation in Earth's atmosphere? Explain
What will be an ideal response?
Imagine the molecule of carbon dioxide sitting in the atmosphere. It is bathed in
longwave (infrared) radiation from Earth below. It can absorb that energy and become
excited, then radiate that energy away. When it reradiates the energy, it can and does emit
the radiation in all directions. So half of the radiation ends up going roughly upward, half
roughly downward. This occurs for each molecule, so the net effect of all the interactions is
to cause part of Earth's outgoing radiation to be trapped.
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Huge collections of stars in space containing anywhere form a few hundred million to more than a trillion stars are referred to as
A) island universes B) galaxy clusters C) star clusters D) galaxies
What is a brown dwarf?
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One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. How long is the tube? The speed of sound in air is 343 m/s
A) 1.34 m B) 0.670 m C) 0.335 m D) 1.00 m E) 2.68 m
A steel sphere sits on top of an aluminum ring. The steel sphere (? = 1.10 × 10^?5/C°) has a diameter of 8 000 cm at 0°C. The aluminum ring (? = 2.40 × 10^?5/C°) has an inside diameter of 7 991 cm at 0°C. Closest to which temperature given will the sphere just fall through the ring?
a. 47°C b. 102°C c. 87°C d. 108°C e. 65°C