A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 7.6 × 1014 Hz
B) 8.5 × 1014 Hz
C) 2.7 × 1014 Hz
D) 9.4 × 1014 Hz
E) 6.8 × 1014 Hz
E
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Suppose NASA wants a satellite to revolve around Earth 5 times a day. What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg)
A) 1.44 × 107 m B) 0.69 × 107 m C) 7.22 × 107 m D) 2.11 × 107 m
Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________
What will be an ideal response?
Contrast the roles of dark matter and dark energy in the fate of the cosmos
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The basic energy resource that fueled the "industrial revolution" was a form of
A) nuclear energy. B) thermal energy. C) gravitational energy. D) chemical energy. E) radiant energy.