Why are reflection nebulae blue in color?
What will be an ideal response?
Reflection nebulae look blue for the same reason the sky looks blue. Short wavelengths scatter more easily than long wavelengths, so blue photons are scattered. The blue color shows that the dust particles must be very small to preferentially scatter blue photons.
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The highest frequency visible light is
a. violet. b. red. c. blue. d. green. e. yellow.
We can find the masses and diameters of stars that are in eclipsing binary systems
a. True b. False Indicate whether the statement is true or false
When you look at a single-slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the wavelength of the light is increased,
a. the pattern shrinks in size (central maximum less wide; other maxima in closer to it). b. the pattern increases in size (central maximum wider; other maxima farther from it). c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.
When the Moon is on the horizon, it appears larger than when it is high in the sky. Why?
A. Its angular size is larger on the horizon. B. This is an optical illusion. C. When it is on the horizon, it is closer to us. D. The brightness of the Moon makes it seem larger. E. Earth's atmosphere acts like a lens, magnifying it.