Why does a good emitter of heat radiation appear black at room temperature?
What will be an ideal response?
A good absorber of radiation is, by design, also a good emitter. This is evident when a good absorber is not generally any warmer than poor absorbers are in the same environment. This balance is called thermal equilibrium. A good emitter appears black at room temperatures, because the radiation it is emitting is too low in frequency to be seen. The rest is logic. Since a good absorber appears black and since a good absorber is also a good emitter, it follows that a good emitter appears black. (Heat a normally black body to incandescence, and you'll find it is a better emitter than a nonblack body of the same temperature.)
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Suppose the eye of a hurricane passed directly above you, and you survived the experience. If winds were from the northeast as the eyewall first approached you, from what direction did the winds blow when the eyewall reached you the second time?
A. southeast B. southwest C. northeast D. northwest
By examining a surface map, the movement of a surface low pressure area can be predicted based
upon the:a. orientation of the isobars in the warm sector. b. region of greatest pressure decrease. c. movement during the previous 6 hours. d. all of the above
Which of the following is true of a reaction which has reached equilibrium?
A) The reactants have been completely converted to products. B) The rate of the forward reaction is faster than the rate of the reverse reaction. C) The rate of the forward reaction is equal to the rate of the reverse reaction. D) The rate of the forward reaction is slower than the rate of the reverse reaction.
A heavy snow event accompanied by strong winds is called a snowstorm
Indicate whether the statement is true or false