What is the energy needed to change an He+ ion into an He++ ion? (The ionization energy of hydrogen is 13.6 eV).
a. 13.6 eV
b. 54.4 eV
c. 92.9 eV
d. 112.4 eV
[Ques. 2] In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 2 level, the circumference for its orbit becomes 4 times greater. This occurs because
a. there are four times as many wavelengths in the new orbit.
b. the wavelength of the electron becomes four times as long.
c. there are twice as many wavelengths, and each wavelength is twice as long.
d. the electron is moving four times as fast.
[Ques. 3] Using quantum theories to study the hydrogen atom allows the prediction and experimental verification of many data about atoms such as He+ and Li2+. Some quantities that can successfully be predicted about He+ and Li2+ in this manner are:
a. the color of the light they will emit.
b. their mass.
c. their abundance in nature.
d. All of the above.
[Ques. 4] The Bohr model of the hydrogen atom accounts for which quantum number?
a. principal
b. orbital
c. orbital magnetic
d. All of the above.
[Ques. 5] Which of the following transitions in hydrogen from an initial state (ni) to a final state (nf) results in the most energy emitted?
a. ni = 80, nf = 2
b. ni = 3, nf = 95
c. ni = 2, nf = 1
d. ni = 1, nf = 3
[Ques. 6] The speed of the electron in the Bohr theory of hydrogen is
a. proportional to n.
b. proportional to n2.
c. inversely proportional to n.
d. inversely proportional to n2.
[Ques. 7] A photon is emitted from a hydrogen atom that undergoes a transition from n = 3 to n = 2 . Calculate the energy and wavelength of the photon. (The ionization energy of hydrogen is 13.6 eV, and h = 6.63 1034 J/s, c = 3.00 108 m/s, 1 eV = 1.60 1019 J, and 1 nm = 109 m)
a. 1.9 eV, 660 nm
b. 1.9 eV, 1050 nm
c. 2.3 eV, 550 nm
d. 2.3 eV, 660 nm
e. 2.3 eV, 1050 nm
[Ques. 8] A hydrogen atom in the ground state absorbs a 13.32-eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6 eV).
a. n = 6
b. n = 10
c. n = 7
d. n = 5
e. n = 11
[Ques. 9] A muon behaves like an electron except that it has 207 times the mass of the electron. If a muon were bound to a proton, how would the energy levels in the Bohr model compare to those for a bound electron?
a. They would be the same.
b. They would be (207)2 times as much as those for the electron.
c. They would be 207 times as much as those for the electron.
d. They would be (1/207) times as much as those for the electron.
[Ques. 10] In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy
a. is equal to the kinetic energy of the electron.
b. is twice the kinetic energy of the electron.
c. is half the kinetic energy of the electron.
d. is equal to n2 times the kinetic energy of the electron.
Quick Reply
