The person who first explained the discrete hydrogen atom spectrum was
a. Max Planck
b. Albert Einstein
c. Neils Bohr
d. Erwin Schroedinger
e. Werner Heisenberg
C
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An artillery shell is fired with an initial velocity of 300 m/s at 55.0° above the horizontal. It explodes on a mountainside 42.0 s after firing. If x is horizontal and y vertical, find the (x, y) coordinates where the shell explodes
If you stand closer to a concave mirror than a distance of one focal length, the image you see is
a. real and inverted. b. real and upright. c. virtual and inverted. d. virtual and upright. e. none of the above because you do not get an image.
Photoelectrons are ejected when monochromatic light shines on a freshly-prepared (oxide-free) sodium surface. In order to obtain the maximum increase in the number of electrons ejected per second, the experimenter needs to
a. increase the frequency of the light. b. increase the intensity of the light. c. increase the area illuminated by the light. d. do all of the above. e. do only (b) and (c) above.
If Earth is closest to the Sun in January, why is much of the Northern Hemisphere cold in January?
A) It is cold because it is winter. B) The Southern Hemisphere is tilted away from the Sun in January. C) Solar energy favors the equatorial regions. D) The Northern Hemisphere is tilted away from the Sun in January.