Electromagnetic Radiation Problems
Honors Chemistry
1. Which one of the following is not a form of electromagnetic radiation?
a) radiant heat
b) sound waves c) radio waves
d) gamma rays
2. Ham radio operators broadcast on 6 meter band (wavelength). What is the frequency of this radiation in
hertz?
3. What is the wavelength (in meters) of a photon (quantum) with an energy of
5.25 x 10-19 J?
4. What is energy of a frequency of 5.6 x 1015 hz?
5. What is the wavelength of the above frequency?
6. What is the frequency of radiation with a wavelength of 0.53m ?
7. Convert 2 x 10-10 m to nanometers, microns (aka micro meter), Angstroms, millimicrons (aka nanometer).
8. A red light has a wavelength of 600 nm, what is its frequency?
9. What is the energy content of one quantum of light from problem #8?
10. Light from the sun has an intensity at a wavelength of 6.0 x 10-7 m, what is the frequency?
Light Calculations Worksheet
c=
E = h h = 6.6262 x 10-34 Js c = 3.00 x 108 m/s
Wavelengths of electromagnetic radiation can be expressed using several units: nanometer, Angstrom, centimeter and
meter. It is important to know how to convert these units into the base unit or meters. Below are the unit equalities.
100 cm = 1m
1 Å = 10-10m
1 nm = 10-9m
Convert the following wavelengths into meters using correct scientific notation:
1. 500 cm = ___________
4. 690 nm = _______________
2.
2300 Å = ___________
5. 40 cm = _______________
3.
14 nm = ____________
6. 895 nm = _______________
Determine which region of the electromagnetic spectrum each wavelength above represents by using the chart on
page 139 and/or Figure 1 below.
7. 500 cm = ___________
10. 690 nm = _______________
8.
2300 Å = ___________
11. 40 cm = _______________
9.
14 nm = ____________
12. 895 nm = _______________
13. Which wave above carries the greatest energy? Explain how you know.
14. Cobalt-60 is a radioactive element used in the treatment of cancer. If the wavelength of gamma radiation of
the cobalt-60 is 1.00 x 10-8 Å, determine its energy.
15. A laser used to detach retinas produces radiation with a frequency of 4.6x10 14 Hz. What is the wavelength
(and color) of this light? Use Figure 1
16. Calculate the energy of an X-ray photon if the wavelength is 5.00x10-10m?
Figure 1
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