Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the longest wavelength?
a.
b.
c.
d
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Why would parallaxes be easier to observe if Earth were farther from the Sun?
What will be an ideal response?
Matter Waves: The spacing of the atoms of a crystal is 159 pm. A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal. What is the energy of each of the neutrons? (mneutron = 1.675 × 10-27 kg, 1 eV = 1.6 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 0.045 eV B. 0.039 eV C. 0.050 eV D. 0.056 eV E. 0.061 eV
Both a transverse wave and a longitudinal wave have
A) amplitude. B) frequency. C) wavelength. D) speed. E) all of the above
If the temperature of the Earth warms up how does the carbon dioxide cycle respond?
A) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere B) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production C) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production D) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere