PHYS 221 Recitation #13
07/29/2014
The ground state configuration for an element is
What is the atomic number of the element?
a. 11
c. 24
b. 9
d. 13
ANS: 13
.
If a hydrogen atom, originally in its ground state of energy -13.6
eV, absorbs a photon of energy 22.0 eV, what is the resulting
kinetic energy of the electron if the proton has negligible kinetic
energy?
ANS: 8.4eV
The ionization energy for the hydrogen atom is 13.6 eV. What is
the energy of a photon that is emitted as a hydrogen atom
makes a transition between the n = 4 and n = 3 states?
a. 3.40 eV
c. 6.80 eV
b. 0.66 eV
d. 2.55 eV
ANS:B
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. 1280 nm
d. 1920 nm
ANS: B
The de Broglie wavelength of a 0.060-kg golf ball is 3.56
m. What is its speed? (h = 6.63 10 34 J s)
ANS: 31m/s
10
34
For the n = 5 shell, what are the lowest values possible for l and
ml
respectively?
a.
–5, –5
c.
0, –4
b.
-4, –4
d.
0, 0
ANS: C
In the Bohr model of a hydrogen atom, what is the magnitude
of the electric force exerted between the proton and the
electron when the electron is in the n = 1 state?
ANS: HW problem so answer not provided.