If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which energy state will it make a transition?
A) n = 2
B) n = 3
C) n = 4
D) n = 5
B
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A velocity selector for ions uses perpendicular electric and magnetic fields. If the electric field used were 800 V/m, what magnetic field would allow the selection of a velocity of 4000 m/s?
A. 0.0400 T B. 0.0800 T C. 0.160 T D. 0.200 T E. 0.500 T
Magnetic Poles: Which one of the following statements is correct?
A. Earth's geographic north pole is the north pole of Earth's magnetic field. B. Earth's geographic south pole is the south pole of Earth's magnetic field. C. The north pole of a magnet points towards Earth's geographic north pole. D. The north pole of a magnet points towards Earth's geographic south pole. E. None of these statements is correct.
Approximately how long does it take stars in our region of the Milky Way to complete an orbit around the center of the Milky Way Galaxy?
A) 20,000 years B) 200,000 years C) 2 million years D) 200 million years E) 2 billion years
In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico. How far has it gotten, approximately?
A) just beyond our Solar System B) not even to the nearest stars C) just a miniscule fraction of the distance across the Milky Way D) almost to the center of the Milky Way E) beyond the Milky Way, to the Andromeda galaxy