An ultraviolet source produces a monochromatic beam of 200-nm light. A shutter allows a pulse to pass that is 10,000 wavelengths long
The uncertainty in the energy of a photon in this pulse is closest to which of the following? ( h = 1.055 × 10-34 J ? s = 6.59 × 10-16 eV ? s, c = 3.00 × 108 m/s)
A) 10-6 eV B) 10-4 eV C) 10-5 eV D) 10-2 eV E) 10-3 eV
B
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What is the wavelength associated with the electron in the n = 6 state of hydrogen?
A) 2.99 × 10-9 m B) 3.11 × 10-9 m C) 4.08 × 10-9 m D) 3.99 × 10-9 m E) 1.99 × 10-9 m
Most of the radioactivity we personally encounter originates from
A) fallout from testing of nuclear weapons. B) nuclear power plants. C) medical X-rays. D) the natural environment.
In a given reversible process, the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume. Select the true statement from among the following:
A) The gas must absorb heat from its surroundings. B) The gas must release heat to its surroundings. C) The pressure of the gas also stays constant. D) The process is adiabatic. E) It is impossible to predict on the basis of this data.
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.