PFC2 Chapter 23 Section 1 Guided Reading
1. What is an electromagnetic wave?
2. How do radio towers make radio waves?
3. Which has more energy: an x-ray (higher frequency) or a microwave (lower frequency)?
4. What is the electromagnetic spectrum?
5. What fraction of a meter is 1 nanometer?
6. As the frequency of an electromagnetic wave increases, its wavelength
_______________.
7. The energy of an electromagnetic wave is proportional to its _______________.
8. Why does light travel slower through glass than through a vacuum?
9. Write the equation for the index of refraction for a material as shown on page 547.
10. The frequency of an electromagnetic wave stays the same as it travels through a
refractive material. What happens to the wavelength?
11. Fill in the type of low-energy electromagnetic wave next to its definition.
a.
wavelengths greater than 30 cm
b.
wavelengths between 30 cm and 1 mm
c.
wavelengths between 1 mm and 700 nm
d.
wavelengths between 700 nm and 400 nm
12. Fill in the type of high-energy electromagnetic wave next to its definition.
a.
wavelengths between 400 nm and 10 nm
b.
wavelengths between 10 nm and around 0.001 nm
c.
wavelengths less than ten-trillionths of a meter
13. Which type of electromagnetic wave is used by cell phone transmitters?
14. Which type of electromagnetic wave causes sunburn?