The voltage across a 10-ohm resistor carrying 5 A is
A) 5 V.
B) 10 V.
C) 15 V.
D) 20 V.
E) more than 20 V.
Answer: E
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A. twice that of each individual battery. B. half that of each individual battery. C. the same as that of each individual battery.
In which binary system can we observe both the stars separately and follow their orbits around each other?
A. eclipsing binary system B. visual binary system C. spectroscopic binary system D. transiting binary system
The wavelength of a particle relates to its
A) momentum. B) energy levels. C) quantum number. D) all of the above E) none of the above
Consider the Bohr model for the hydrogen atom. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
(a) How much energy (in eV) is needed to cause a transition of an electron from the second excited state to the third excited state? (b) What wavelength photon just has enough energy to initiate the transition in (a)?