The Doppler radial velocity technique works best for:
A) planets whose orbits are along our line of sight.
B) planets whose orbits are perpendicular to our line of sight.
C) planets whose orbits are nearly circular.
D) planets whose orbits are very eccentric.
A
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Most of the mass in the Milky Way Galaxy is located
A) in the halo (above/below the disk). B) within the disk. C) in the stars in the spiral arms. D) in the gas and dust. E) in the central bulge of the galaxy.
A doubly charged ion with velocity 6.9 × 106 m/s moves in a path of radius 30 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion?
A) 11 × 10-27 kg B) 6.7 × 10-27 kg C) 4.5 × 10-27 kg D) 3.3 × 10-27 kg E) 8.2 × 10-27 kg
How long is a day on Mars?
A) 243 Earth days B) about 4.2 Earth days C) 24 hours, 36 minutes D) 23 hours, 56 minutes E) 9 hours, 55 minutes
How many atoms of oxygen are contained in 44 g of carbon dioxide, CO2?
a. 3.01 × 10^23 b. 12.0 × 10^23 c. 6.02 × 10^23 d. None of these