If light excites atomic hydrogen from its lowest energy level to the n = 12 level, what is the energy of the photons of this light?
A) 13.5 eV
B) 32.2 eV
C) 13.6 eV
D) 0.0944 eV
E) 1.13 eV
A
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Why has NASA sent recent orbiters to Mars on trajectories that required them to skim through Mars's atmosphere ("aerobraking") before settling into their final orbits?
A) It saved money because the spacecraft used atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines. B) It allowed the orbiters to get higher resolution pictures of the surface as it came close when skimming through the atmosphere. C) It allowed the spacecraft to collect samples of the atmospheric gas for return to Earth. D) Each spacecraft also carried a lander, and the lander could only be dropped to the Martian surface when the spacecraft passed through the atmosphere.
Acetic acid consists of a(n) ______________ group attached to a carboxyl group
a. amino b. methyl c. hydroxyl d. ethyl
A nonuniform, 80.0-g, meterstick balances when the support is placed at the 51.0-cm mark. At what location on the meterstick should a 5.00-g tack be placed so that the stick will balance at the 50.0 cm mark?
A) 16.0 cm B) 67.0 cm C) 66.0 cm D) 35.0 cm E) 34.0 cm
A paperclip with the density of a neutron star would weigh (on the Earth)
A) more than the Earth. B) more than Mt. Everest. C) a few tons. D) about the same as a regular paperclip. E) more than the Moon.