Can diffuse radiation be concentrated?
What will be an ideal response?
Diffusive radiation, by its definition and nature, cannot be concentrated.
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In a metal specimen subjected to a constant electric field, the drift velocity of the free electrons is:
(a) The same for all free electrons. (b) A linearly increasing function of time for all free electrons. (c) Dependent upon the electron quantum numbers. (d) Dependent upon the electron energy.
Which of the following is the best answer to the question "Why does the Sun shine?"
A) The Sun initially began generating energy through nuclear fusion as it formed, but today, it generates energy primarily through the sunspot cycle. B) The young Sun became hotter through gravitational contraction. Once the core was hot enough, nuclear fusion began and has kept the Sun shining ever since. C) The Sun initially began making energy through chemical reactions. These heated the interior enough to allow gravitational contraction and nuclear fusion to occur. D) As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity.
What are the mechanisms that restrict the mass range of stars to about 0.1 to 100 solar masses?
What will be an ideal response?
Two moles of gas are at STP. If the temperature changes to 47.°C and the pressure decreases to half of what it was, what volume do the two moles now occupy?
What will be an ideal response?