An ohm is equivalent to a(n)
A. volt/meter.
B. coulomb/volt.
C. ampere/coulomb.
D. volt/ampere.
E. ampere·coulomb.
D. volt/ampere.
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Within Earth's atmosphere, in which layer does convection occur?
A) the troposphere B) the stratosphere C) the mesosphere D) the ionosphere E) Convection occurs in all layers of Earth's atmosphere.
Quasar spectra often show many absorption lines that all appear to be due to the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows—it remains perhaps the greatest mystery about quasars.
How do interference and diffraction differ? How are they similar?
What will be an ideal response?
A zoom lens for a camera is adjusted to change its focal length from 38 mm to 304 mm. If the same amount of light is to be admitted to the lens in both cases, what is the final f-number if the original f-number was f/2.0?
What will be an ideal response?