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Answer the following statement true (T) or false (F)
True
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The number of comets in the Oort cloud is probably about
A) a thousand. B) a million. C) a billion. D) a trillion. E) a quintillion.
Which of the following correctly describes the meaning of albedo?
A) The lower the albedo, the more light the surface reflects, and the less it absorbs. B) The higher the albedo, the more light the surface reflects, and the less it absorbs. C) The higher the albedo, the more light the surface absorbs. D) The higher the albedo, the more light the surface emits. E) The higher the albedo, the more light the atmosphere absorbs.
A flat roof is modeled as a flat plate insulated on the bottom and placed in the sunlight. If the radiant heat that the roof receives from the sun is 600 W/m2 , the convection heat transfer coefficient between the roof and the air is 12 W/(m2 K), and the air temperature is 27°C, determine the roof temperature for the following two cases: (a) Radiative heat loss to space is negligible. (b) The roof is black (? = 1.0) and radiates to space, which is assumed to be a black-body at 0 K.
GIVEN
FIND
ASSUMPTIONS
- Steady state prevails
- No heat is lost from the bottom of the plate
SKETCH
An excited atom can lose energy by emitting an electron
a. True b. False Indicate whether the statement is true or false