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Light
EM spectrum, reflection, and the speed of light
1. What is the range of wavelengths that yellow light may have? 5.77×10-7 - 5.96×10-7 m
2. The angle between the incident ray and the surface it strikes is 25°. What is the angle of
reflection? 65°
3. A beam of light is incident on ethyl alcohol. What is the speed of the light in the new
material? 2.2×108 m/s
4. Which of the following could have the highest frequency?
a. AM radio waves
c. X-rays
b. Blue light
d. UV rays
5. All EM waves have the same _____ in a vacuum?
a. color
c. wavelength
b. frequency
d. speed
6. The angle of incidence for a ray of light is 17°. What is the angle between the incident
and reflected ray? 34°
7. An infrared ray could have a wavelength of:
a. 1 millimeter
c. 1 nanometer
b. 1 kilometer
d. 1 picometer
8. What is the wavelength of light traveling through zircon if it has a frequency of 5.09×1014
Hz? 3.07×10-7 m
9. A beam of yellow light is traveling through a material. If it has a speed of 2.26×108 m/s,
what is the material it is traveling through? water
10. A ray of light strikes a surface at an angle. If it is reflected at an angle of 30°, what was
the angle of incidence? 30°
11. What is the frequency of an EM wave that has a wavelength of 1.5 m in a vacuum? What
type of wave could this be? 2×108 m/s
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