In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy:
a. is half the kinetic energy of the electron.
b. is equal to n2 times the kinetic energy of the electron.
c. is equal to the kinetic energy of the electron.
d. is twice the kinetic energy of the electron.
[Ques. 2] In the Bohr model of the atom, the orbits where electrons move slowest:
a. have the least radius.
c. have the least angular momentum.
b. have the highest energy.
d. have the lowest energy.
[Ques. 3] The four visible colors emitted by hydrogen atoms are produced by electrons:
a. that start in the ground state.
c. that end up in the level with n = 2.
b. that end up in the ground state.
d. that start in the level with n = 2.
[Ques. 4] The ionization energy of the hydrogen atom is 13.6 eV. What is the wavelength of a photon having this much energy? (h = 6.63 10-34 Js, c = 3.00 108 m/s, 1 eV = 1.6 10-19 J, and 1 nm = 10-9 m)
a. 91.4 nm
c. 136 nm
b. 360 nm
d. 273 nm
[Ques. 5] The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 10-34 Js. The ground state of hydrogen is at 13.6 eV.)
a. 91.4 nm
c. 456 nm
b. 273 nm
d. 122 nm
[Ques. 6] The Paschen series of hydrogen corresponds to electron transitions from higher levels to n = 3 . What is the longest wavelength in that series? (h = 6.63 10-34 Js. The ground state of hydrogen is at 13.6 eV.)
a. 822 nm
c. 1880 nm
b. 365 nm
d. 1094 nm
[Ques. 7] If the radius of the electron orbit in the n = 1 level of the hydrogen atoms is 0.0529 nm, what is its radius for the n = 4 level? (Assume the Bohr model is valid).
a. 1.32 nm
c. 0.106 nm
b. 0.265 nm
d. 0.846 nm
[Ques. 8] The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of a photon emitted corresponding to a transition from the n = 6 to n = 2 state?
a. 7.9 eV
c. 3.0 eV
b. 2.9 eV
d. 4.0 eV
[Ques. 9] The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n = 5 state?
a. 0.544 eV
c. 0.544 eV
b. 0.378 eV
d. 0.378 eV
[Ques. 10] What is the wavelength of the line in the hydrogen spectrum that is comprised of transitions from the n = 5 to the n = 3 levels?
a. 1880 nm
c. 2250 nm
b. 1290 nm
d. 1920 nm
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