Active galaxies emit most of their energy in ________ wavelengths than visible
Fill in the blank(s) with correct word
longer
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If a star has an extrasolar planet, the amplitude of its radial velocity curve is related to the planet's
A) mass B) orbital shape C) orbital period D) radius
Iron has an FCC structure at temperatures just above 912°C, and the lattice parameter is 0.3589 nm. Assume that BCC iron’s atomic radius is equal to 0.1241 nm as given in Appendix C, and for carbon it is 0.0077 nm. The atomic radius of iron should not increase with temperature and with changes in crystal structure; only the size of the lattice changes.
(a) Calculate the radius ratio of carbon to iron to see if it is appropriate for octahedral coordination. (b) Calculate diameter of the space available for the octahedral site at the center of the FCC unit cell, and compare this to the diameter of a carbon atom. (c) Comment on the diameter available relative to the diameter of the carbon atom and upon the possibility of solubility of carbon in FCC iron at octahedral interstitial sites. Also comment on the expected relative solubility of carbon in octahedral sites in FCC and BCC iron (see Problem 3.3).
Why can't the Moon always pass through the center of the umbra? a. The Moon's rotation is slightly faster than its revolution around Earth. b. The Moon's orbit is inclined by 5 degrees to the plane of Earth's orbit. c. The Moon's synodic cycle changes a few minutes per cycle
d. The Moon's orbit changes with the seasons. e. The Moon is not in its full moon lunar phase.
How do the tides slow the rotation of Earth?
A. Tidal bulges move mass away from the center of Earth, slowing its rotation like a figure skater. B. The tip in the Moon's orbital plane makes moving the tidal bulges away from the equator more difficult. C. Alternating high and low tides create a wobble in Earth's rotation. D. Tidal bulges generate drag forces between Earth and its water, slowing its rotation.