Which method does the Kepler space telescope use to detect extrasolar planets?
a. Doppler method
b. microlensing method
c. wobble method
d. transit method
e. astrometric method
d
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Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?
A) Vega and RXJ1800 must be very close to each other, less than a few light years. B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights. C) Vega orbits the center of mass of RXJ1800. D) RXJ1800 and Vega will set in the west, at very similar times.
A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface?
A) 0.32 eV B) 0.21 eV C) 0.42 eV D) 0.16 eV E) 0.48 eV
When sulfur-35 (Z = 16) decays to chlorine-35 (Z = 17), an alpha particle is emitted
Indicate whether the statement is true or false
The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center. b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion. d. the Copernican system assumed all planets orbited the Sun