By S. Chandrasekhar, Space
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Another way to put more energy into a rope wave is to wiggle the end of the rope more rapidly (again our arm tires more quickly); this means increasing the frequency of the wave, and again the same idea applies to an electromagnetic wave. So waves of higher frequency carry more energy, but as we’ve already seen and as Equation (1) tells us; a higher frequency means a shorter wavelength; the shorter the wavelength of light the more energy it carries. Thus, in the visible part of the spectrum, blue light carries more energy than red light.
From Light to Starlight 37 that differ by one whole wavelength, two whole wavelengths, and so on. Having previously measured with great care the distance “a” between the two slits and the distance “D” to the screen, the distance “y” between the central light band and one of its nearest neighbors is measured. This turns out to be given by y = λ × D/a (5) and so the wavelength of the light λ is given by λ = a × y/D (6) If you’re good at trigonometry, you should have no difficulty in figuring this out; don’t worry, however, if you’re not.
The Stefan–Boltzmann equation tells us two things. First, it tells us that the rate at which energy is emitted from each square meter of the surface of a blackbody depends only on the body’s temperature and is in fact proportional to the fourth power of its temperature. , the blackbody’s rate of emission of energy equals its rate of absorption. What this means is that to increase the temperature of a blackbody, we need to increase the rate at which it absorbs energy. One way to do this for our blackbody table would be to move it closer to the equator so that the Sun is closer to the zenith; this results in the sunlight falling on the table being more concentrated, resulting in the table getting hotter.