Name _______________________________________ Date _________________ Period __________
Chemistry Homework 4A (18 points)
1. List five examples of electromagnetic radiation: (2 points)
Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, x-rays,
gamma rays
2. What is the speed of all forms of electromagnetic radiation in a vacuum? (1 point)
3.0 × 108 m/s, speed of light
3. Write the equation that relates the frequency and wavelength of any form of electromagnetic
radiation. (1 point)
c = λν
4. What is the wavelength range of visible light? (1 point)
380 nm to 780 nm (3.8 × 10-7 m to 7.8 × 10-7 m)
5. List the colors of light in the visible spectrum in order of
a. increasing frequency (1 point)
red, orange, yellow, green, blue, violet
b. increasing wavelength (1 point)
violet, blue, green, yellow, orange, red
6. List the types of electromagnetic radiation in order of
a. increasing frequency (1 point)
radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, xrays, gamma rays
b. increasing wavelength (1 point)
gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation,
microwaves, radio waves
7. What is the relationship between f and w? (1 point)
As one increases the other decreases.
General Chemistry – HOMEWORK
8. Determine the frequency of light with a wavelength of 4.257 × 10-7 cm. What type of
electromagnetic radiation is this? (2 points: 1 point math, 1 point kind of EMR)
4.257 x 10-7 cm = 4.257 x 10-9 m
c = λν
3.0 x 108 m/s = (4.257 x 10-9 m) ν
7.0 × 1016 Hz ; ultraviolet
9. What is the frequency of light with a wavelength of 9.16 × 10-3 m. what type of electromagnetic
radiation is this? (2 points)
c = λν
3.0 x 108 m/s = (9.16 x 10-3 m )ν
3.28 × 1010 s-1; microwaves
10. What is the wavelength of light with a frequency of 6 × 1014 s-1? What is the color of this light?
(2 points)
c = λν
3.0 x 108 m/s = λ(6 x 1014 Hz)
5 × 10-7 m; green
11. How long would it take a radio wave with a frequency of 7.25 × 105 s-1 to travel from Mars to
Earth if the distance between the two planets is approximately 8.00 × 107 km? (2 points)
Distance = rate x time
8.00 x 107 km = 8.00 x 1010 m
8.00 x 1010 m = (3.0 x 108 m/s)s
267 seconds (4.4 minutes)
KEY IDEA HERE: ALL FORMS OF EMR TRAVEL AT THE SPEED OF LIGHT
General Chemistry – HOMEWORK