Giant molecular cloud complexes are located in spiral arms
a. True
b. False
Indicate whether the statement is true or false
True
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A 0.61 m radius hemisphere (811 K surface temperature) is filled with a gas mixture containing 6.67 % CO2 and water vapor at 0.5 % relative humidity at 533 K and 2-atm pressure. Determine the emissivity and absorptivity of the gas, and the net rate of radiant heat flow to the gas.
GIVEN
A hemisphere filled with a gas mixture
Hemisphere radius (r) = 0.61 m
Hemisphere surface temperature (T1) = 811 K
Gas temperature (Tm) = 533 K
Gas pressure (pT) = 2 atm
Gas mixture: 6.67% of CO2 and water vapor at R.H. = 0.5%
FIND
(a) The emissivity (?m) and absorptivity (?m) of the gas
(b) The net rate of radiant heat flow to the gas (q1–m)
ASSUMPTIONS
The hemisphere surface is black (?1 = 1)
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant
the saturation pressure of water at 533
The velocity dispersion method can be used to find the _______________ of a galaxy
Fill in the blank(s) with correct word
Emission lines of hydrogen that are found in the ultraviolet part of the electromagnetic spectrum are formed by electrons transitioning from:
A) any level to level 2. B) level 2 to any level. C) any level to level 1. D) level 1 to any level. E) any level to level 3.
A mover slides a refrigerator 5 meters across a floor. If a force of 200 N was used, how much work was done?