Download Golden Valley HS • Chemistry

Golden Valley HS • Chemistry
Name _______________________________
Period: ______________
3 • Electrons & Periodicity
Light & Quantum Mechanics – WS 5
Relevant textbook pages: 372 - 382
Section Objectives
 Students will be able to calculate the wavelength, frequency or energy of light given two of these values.
 Students will be able to label a wave diagram identifying the wavelength, amplitude, trough and crest.
E = h
c=
 = h/mv
c = 3.00 x 108 m/s
h = 6.6262 x 10-34 J-s
1. Calculate the wavelength of the yellow light emitted by a sodium lamp if the frequency of the
radiation is 5.10 x 1014 Hz (1 Hz is the same as 1/s or s-1).
2. What is the wavelength of radiation with a frequency of 1.50 x10-13 s-1? Does this radiation have a
longer or shorter wavelength than red light?
3. What frequency is radiation with a wavelength of 5.00 x 10-6 cm? In what region of the
electromagnetic spectrum is this radiation?
4. Calculate the energy (in J) of a quantum of energy with a frequency of 5.00 x 1015 s-1.
5. What is the energy of a photon of microwave radiation with a frequency of 3.20 x 1011 s-1?
6. A hydrogen lamp emits several lines in the visible region of the spectrum. One of these lines has a
wavelength of 6.56 x 10-5 cm. What is the frequency of this radiation?
7. Compare the ground state and the excited state of an electron.
8. Arrange the following in order of increasing wavelength:
a. infrared radiation from a heat lamp
b. dental x-rays
c. signal from a shortwave radio
9. What happens when a hydrogen atom absorbs a quantum of energy?
S. Cool, 2009
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