The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 3, when it is undergoing radiative contraction and its life track moves up and to the left?
A) Its surface temperature and luminosity increase.
B) Its surface temperature remains the same and its luminosity decreases.
C) Its surface temperature and luminosity decrease.
D) Its surface temperature decreases and its luminosity increases.
E) Its surface temperature and luminosity remain the same.
A) Its surface temperature and luminosity increase.
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The most accurate way to determine the surface temperature of a star is to study the pattern of emission lines from various atoms
a. True b. False Indicate whether the statement is true or false
In addition to the electric force law and the magnetic force law, the other key principle that is needed to explain electromagnetic waves is
A) electromagnetic forces can be felt across a distance. B) Newton's law of motion. C) electromagnetic fields are established instantaneously. D) forces always come in pairs, so for every sender of electromagnetic force there must be a receiver. E) electromagnetic fields are not established instantaneously.
Why does the high specific heat of water make it useful as a coolant?
What will be an ideal response?
Applications to Astronomy: The cosmic background radiation corresponds to a temperature of about
A. 1.4 K. B. 2.7 K. C. 8.0 K. D. 20 K.