According to Einstein, as the wavelength of the incident monochromatic light beam becomes shorter, the work function of a target material in a phototube:
a. increases.
b. decreases.
c. remains constant.
d. is directly proportional to wavelength.
c
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Supernovae are ____
a. very common: there are thousands of detectable events occurring in our galaxy each year b. common: a few dozen are detected in our galaxy each year c. uncommon: there are only one or two detected in our galaxy each year d. rare: only one or two occur each century in our galaxy e. extremely rare: only one or two are detected in the Universe each decade
When was the first confirmed exoplanet discovered?
A) Shortly after the invention of the telescope, in the early 1600s B) In prehistoric times C) Around 350 BC, by the Ancient Greeks D) Early in the 21st century E) Near the end of the 20th century
When the nucleus of an atom emits only a gamma ray, the atom's atomic number
A) decreases. B) remains unchanged. C) increases.
If the potential energy diagram, when shown as a function of the separation of the atoms in the molecule, has a positive slope, then the force between the atoms
A) has the highest possible value. B) is attractive. C) has the lowest possible value. D) is repulsive. E) is none of the above.