A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits? (Hint: Review the use of Newton's version of Kepler's Third law from Ch. 4)
A) Planet 2's semimajor axis is about 5 times smaller than Planet 1's.
B) Planet 2's semimajor axis is about 3 times smaller than Planet 1's.
C) Planet 2's semimajor axis is about 3 times larger than Planet 1's.
D) Planet 2's semimajor axis is about 5 times larger than Planet 1's.
C
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Briefly explain why Mercury, Venus, and the Moon do not have significant erosion. Relate erosional activity to planetary size and distance from the Sun
What will be an ideal response?
How can a half-life be used to tell the age of a sample?
A) The half-life of an isotope is constant. B) The amount of radioactive form depends on the amount of radiation in the surroundings. C) The ratio between the radioactive form and the stable form depends on the archaeological record. D) The ratio between the radioactive form and stable form varies regularly with time. E) both C and D
Electrons are collected by removing them from the atoms in a sample of water vapor (H2O, molecular mass 18u). If every hydrogen atom has lost an electron in the process, what is the mass of the sample if a charge of exactly 1.0C was collected?
A. 62 ?g B. 370 ?g C. 93 ?g D. 180 ?g
The transit method of planet detection works best for
A) big planets in face-on orbits around small stars. B) big planets in edge-on orbits around small stars. C) Earth-like planets in any orbit. D) small planets in face-on orbits around big stars. E) small planets in edge-on orbits around big stars.