In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optical axis. To the extent that this condition is not completely met, which one of the following effects occurs?
a. mirages
c. spherical aberration
b. chromatic aberration
d. light scattering
C
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The observed slowing of a clock in the vicinity of a black hole is a prediction of
A) the Roche Limit. B) Special relativity. C) General relativity. D) Stellar nucleosynthesis. E) the Cosmological Principle.
A horizontal metal bar rotates at a constant angular velocity w about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The emf induced between the two ends of the bar is
A) constant and proportional to the product B ?. B) constant and proportional to the product B ?2. C) constant and proportional to the product B2 ?2. D) variable with a maximum of B ?. E) variable with a maximum of B ?2.
Of the following gases, which is the most important contributor to the Earth's greenhouse effect?
a. water vapor b. ozone c. CFCs d. methane
The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)
a. 91.4 nm c. 456 nm b. 273 nm d. 122 nm