What is the ionization energy of the hydrogen atom in the n = 2 state?
A. 13.6 eV
B. -13.6 eV
C. 3.40 eV
D. -3.40 eV
E. -1.51 eV
C. 3.40 eV
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What does cosmological redshift do to light?
A) stretches its wavelength B) makes it brighter C) makes it slow down D) makes all light infrared
You obtain a 100. W lightbulb and a 50. W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct?
A) Both bulbs glow at the same increased brightness. B) The 100-W bulb glows brighter than the 50-W bulb. C) Both bulbs glow at the same reduced brightness. D) The 50-W bulb glows more brightly than the 100-W bulb.
Uniform Circular Motion: A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A. 0.050 m/s2 B. 1.4 m/s2 C. 48 m/s2 D. 200 m/s2 E. 0.00 m/s2
What is the primary source of energy for protostars (that have not yet become hot enough for fusion in their cores)?
A) fission from concentrated radioactive elements B) high-energy photons from nearby stars C) gravitational contraction D) the conversion of mass into energy in accord with E = mc2