How does Stefan's law and a knowledge of Earth's history tell us that the Sun's temperature cannot have varied much in the last 3.5 billion years?
What will be an ideal response?
Since even a small change in temperature, raised to the fourth power, would result in a large change in the total solar energy radiated, if the Sun had cooled much, our oceans would have frozen and life would have ceased to exist here.
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A supernova remnant, such as the Crab nebula, is heated by the ________
Fill in the blank(s) with correct word
Electrons are accelerated through a potential difference V and then strike a dense target. In the x-rays that are produced
A. the maximum wavelength depends on V. B. the wavelength of the characteristic peaks depend on V. C. the minimum wavelength depends on V. D. the wavelength of the Bremsstrahlung depends on V.
A charged particle (mass = m, charge = q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
a. qvB toward the east b. Zero c. qvB toward the west d. qvB upward e. qvB toward the south
If a surface is illuminated by magenta light and the red is absorbed, then the color of the surface will appear as
A. green. B. yellow. C. blue. D. red.