EM Radiation Worksheet
Advanced Chemistry 2013 – 2014
Name:
Block:
Show all work for the questions below. Pay attention to significant figures and units.
Remember that 1 nanometer (nm) = 10 -9 meters
1.
Answer the following questions about light. a.
What color is 560 nm light? b.
What is the frequency of 560 nm light? c.
In what region of the EM spectrum does 1100 nm light fall? d.
What is the energy of one quantum of 1100 nm light? e.
What is the wavelength of light that has a frequency of 5.45 x 10 16 Hz? f.
In what range of the EM spectrum does 5.45 x 10 16 Hz EM radiation fall?
2.
The light output of a common laser used in reading compact disc and DVD information has a wavelength of 765 nm. a.
In what region of the spectrum is this laser light? b.
What is the frequency of this laser light? c.
What is the energy of one quantum of CD laser light? d.
If a CD laser has a power output of 0.30 watts, then how many quanta of laser light does the laser emit each second? (1 Watt = 1 J/s)
Copyright © 2009, Alan D. Crosby, Newton South High School, Newton, MA 02459

3.
Pick your favorite radio station in the Boston area. (FM – not AM!) a.
List the station call letters and the frequency of transmission. (FM is in the MHz range.) b.
Calculate the wavelength of the broadcast signal from your favorite radio station. c.
What is the energy of one quantum of EM radiation from the broadcast signal of your favorite radio station? d.
If you listened to a radio station that has a transmission wavelength that is twice that of your favorite radio station, at what frequency would you find this station on your radio dial? e.
What is the wavelength of EM radiation that has 1000 times more energy per
quantum than your favorite radio station? In which range of EM radiation does this wavelength fall on the EM spectrum? f.
What is the wavelength of the EM radiation that has 10 million times more energy
per quantum than your favorite radio station? In which range of EM radiation does this wavelength fall on the EM spectrum? g.
Many radio stations transmit their signal with “fifty thousand watts of power.” How many quanta per second of radio wave energy will your favorite radio station’s transmitter emit if it transmits with 50,000 watts of power?
Copyright © 2009, Alan D. Crosby, Newton South High School, Newton, MA 02459