What is the thermosphere?
A) the lowest layer in the atmosphere
B) the part of the atmosphere that absorbs optical light
C) the part of the atmosphere that absorbs ultraviolet
D) the part of the atmosphere that absorbs x-rays
D) the part of the atmosphere that absorbs x-rays
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Light escaping from white dwarfs will show a gravitational redshift
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Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of
What is the work function of this metal? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 3.73 eV B) 3.13 eV C) 4.33 eV D) 4.92 eV
Many supernovas are thought to result in
A) neutron stars. B) regular stars like our sun. C) red giant stars. D) white dwarfs.
Helium always has two neutrons in its nucleus
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