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Chapter Twelve Extra Practice Problems
1.
The yellow light given off by a sodium vapor lamp has a wavelength of 589 nm.
What is the frequency of this radiation?
5.09 x 10
14
s
-1
2.
A laser used to weld detached retinas produces radiation with a frequency of 4.69 x
10
14
s
-1
.
What is the wavelength, in nm, of this radiation?
640. nm
3.
Calculated the smallest increment of energy (that is, the quantum of energy) that an
object can absorb from yellow light whose wavelength is 589 nm.
E = 3.37 x 10
-19
J
4.
A laser that emits light energy in pulses of short duration has a frequency of 4.69 x
10
14
s
-1
and deposits 1.3 x 10
-2
J of energy during each pulse.
How many quanta of
energy does each pulse deposit? (Hint:
First calculate the energy of one quantum of this
frequency.)
4.2 x 10
16
quanta
5.
How many subshells are in
n
= 4?
Label each subshell and determine how many
orbitals are in each.
There are four subshells in the fourth shell, corresponding to the four possible
values of
l
(0, 1, 2, 3).
The subshells are labeled 4
s
, 4
p
, 4
d
, and 4
f
.
The number
given in the designation of the subshell is the principle quantum number,
n
.
The
following letter designates the value of
l .
There is one 4
s
orbital.
There are three 4
p
orbitals, five 4
d
orbitals, and seven 4
f
orbitals.
6.
What do we mean when we say that energy is quantized?
Quantization means that energy can be absorbed or emitted only in specific
amounts or multiples of this amount.
This minimum amount of energy is equal to a
constant times the frequency of the radiation absorbed or emitted.
7.
A high-powered laser is pulsed for a period of 100 ns.
During that time, it emits a
signal with a total energy of 8300 J.
If the wavelength of the signal is 351 nm, how many
photons have been emitted?

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