In a double slit experiment, a beam of electrons strikes a pair of slits
The slits are 15 ?m apart, and the first interference maximum lies at an angle of 0.50 µrad from the center of the interference pattern. What is the momentum of the incoming electrons? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 8.8 × 10-23 kg ? m/s
B) 1.1 × 10-23 kg ? m/s
C) 2.2 × 10-23 kg ? m/s
D) 4.4 × 10-23 kg ? m/s
E) 6.6 × 10-23 kg ? m/s
A
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The unified model describes active galactic nuclei using
a. a supermassive black hole at the center of a normal spiral galaxy. b. a supermassive black hole surrounded by an accretion disk and dense disk of gas. c. an accretion disk around a neutron star. d. gravitational lenses to intensify the radiation coming from them. e. different lines of sight toward and dwarf irregular galaxy.
Two charged particles 1 m apart exert a 1-N force on each other. If the magnitude of each charge is doubled, the force on each particle will be
A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) none of the above
Helium originates from
A) stellar nucleosynthesis only. B) the Big Bang only. C) mostly from stellar nucleosynthesis with a small contribution from the Big Bang. D) radioactive decay of elements heavier than carbon. E) mostly from the Big Bang with a small contribution from stellar nucleosynthesis.
Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
a. Venus b. the Moon c. Phobos d. Mars e. None of the terrestrial planets or satellites show such evidence.