The person who first explained the photoelectric effect was
a. Max Planck.
b. Albert Einstein.
c. Neils Bohr.
d. Erwin Schrödinger.
e. Werner Heisenberg.
b
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What is a "planetary nebula"?
A. It is what is left when a white dwarf star explodes as a supernova. B. It is a shell of gas ejected from a star late in its life. C. It is the cloud from which protostars form. D. It is the disk of gas around a young star.
What is the change in entropy when 15.0 g of water at 100°C are turned into steam at 100°C? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) 90.8 J/K B) -90.8 J/K C) 339 J/K D) -339 J/K E) 0 J/K
Which of the following models best explains why our galaxy has spiral arms?
A) The spiral arms are a wave of star formation caused by a wave of density propagating outward through the disk of the galaxy. B) The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates. C) The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation. D) No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy.
Two point charges are placed along a horizontal axis with the following values and positions: +3.0 µC at x = 0 cm and -6.0 µC at x = 20 cm. At what point along the x axis is the electric field zero?
a. 8.0 cm c. -38 cm b. -48 cm d. -69 cm