Planck's quantum theory is compatible with the experimental data related to which of the following?
a. blackbody radiation
b. the photoelectric effect
c. line spectra emitted by hydrogen gas
d. all of the above
[Ques. 2] Star A has the peak of its blackbody radiation at A. Star B has its peak at B, which is one-third that of A. If Star A's surface temperature is TA, how does the surface temperature TB of Star B compare?
a. TB = TA/9 b. TB = 3TA
c. TB = 9 TA d. TB = TA/3
[Ques. 3] As the temperature of a radiation emitting blackbody becomes lower, what happens to the peak wavelength of the radiation?
a. remains constant
b. increases
c. decreases
d. is directly proportional to temperature
[Ques. 4] Which of the following conditions must be satisfied for laser action?
a. A ruby or similar crystalline material must be used.
b. A population inversion must occur.
c. The photons must be red.
d. A binary system must be used.
[Ques. 5] In neon, the 20.80-eV level can undergo lasing action to the 17.43-eV level. What is the energy of the resulting photons?
a. 20.80 eV
b. 17.43 eV
c. 38.23 eV
d. 3.370 eV
e. 1.685 eV
[Ques. 6] A ruby laser can deliver a 4.33-J pulse in approximately 50 nanoseconds. The wavelength of the light is 694 nm. At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 1034 Js, c = 3.00 108 m/s, 1 eV = 1.6 1019 J, and 1 nm = 109 m)
a. 3.5E+18
b. 3.0E+17
c. 1.5E+19
d. 1.5E+21
e. 1.1E+18
[Ques. 7] The wavelength of coherent ruby laser light is 694 nm. What energy difference exists between the upper excited state involved and the lower unexcited ground state? (h = 6.63 1034 Js, c = 3.00 108 m/s, 1 eV = 1.60 1019 J, and 1 nm = 109 m)
a. 0.56 eV
b. 1.79 eV
c. 1.67 eV
d. 2.87 eV
e. 0.35 eV
[Ques. 8] The red light from a HeNe laboratory laser results from a transition in Ne. Determine the wavelength of the light given off if the energy difference between states is 1.08 eV. (h = 6.63 1034 Js, c = 3.00 108 m/s, 1 eV = 1.60 1019 J, and 1 nm = 109 m)
a. 383 nm
b. 1840 nm
c. 1150 nm
d. 1340 nm
e. 203 nm
[Ques. 9] The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. high voltage
b. high flux of electrons
c. nearby presence of photons of same wavelength as those emitted
d. high temperature
[Ques. 10] When a hydrogen atom absorbs a photon that raises it to the n = 7 state, what is the greatest number of photons that can be emitted by that atom as it returns to the ground state?
a. 6
b. 7
c. 8
d. 14
e. The correct answer is not given.
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