What makes a transition from a higher energy state to a lower energy state when aphoton is emitted by an atom?
a) electron
b) proton
c) photon
d) graviton
e) neutron
Answer: a) electron
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Physicists have detected hot dark matter particles in terrestrial laboratories, but it is much harder to observe than cold dark matter
Indicate whether the statement is true or false
Increasing the wavelengths in a double-slit experiment has what effect on the position of maxima on a screen at fixed distance?
A. none B. maxima get closer together C. maxima get farther apart D. maxima get cancelled by minima E. maxima pass minima on the screen
Iron meteorites are believed to come from
A) the core of a differentiated asteroid, now broken up. B) the crust of a differentiated asteroid, now broken up. C) interstellar space. D) debris from the Kuiper Belt. E) a broken up cometary nucleus.
When gravitational, magnetic and any forces other than static electric forces are not present, electric field lines in the space surrounding a charge distribution show
a. the directions of the forces that exist in space at all times. b. only the directions in which static charges would accelerate when at points on those lines c. only the directions in which moving charges would accelerate when at points on those lines. d. tangents to the directions in which either static or moving charges would accelerate when passing through points on those lines. e. the paths static or moving charges would take.