Calculate the energy in electron volts of the photon emitted when an electron in a hydrogen atom goes from n = 2 to n = 1
10.20 eV (-3.40 eV + 13.60 eV)
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An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2, with R1 < R2 . Both positive radii are measured from the same side with R2 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?
a. This is neither, since a lens cannot be made this way. b. This is a diverging lens. c. This can be either a converging or diverging lens, as more information is needed for a final determination. d. This is a converging lens.
The weight of air in a bathtub (about 1/3 cubic meter) is about the same as the weight of
A) a pea. B) an egg. C) a small apple. D) a pound of butter. E) a 10-pound sack of potatoes.
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
A typical space telescope is operated by how many astronauts?
A) 7 B) 5 C) 3 D) 1 E) 0