1. Chapter 14 Light and Reflection

2. 1 Light is a form of electromagnetic radiation

3. All electromagnetic radiation travels at c = 3.00 x 10 8 m/s c = f constant

5. Radio Waves longest wavelength ˃ 0.3 m smallest frequency f ˂ 10 9 Hz Used to transmit radio and tv signals

6. Microwaves wavelength 0.3m ˃ ˃ 1 x 10 -3 m frequency 1 x 10 9 Hz ˂ f ˂ 3 x 10 11 Hz Used in radar, ovens and communication (cell phones)

7. Infrared wavelength 1 x 10 -3 m ˃ ˃ 700 nm frequency 3 x 10 11 Hz ˂ f ˂ 4.3 x 10 14 Hz ~heat~

8. Visible Light wavelength 700 nm (red) ˃ ˃ 400 nm (violet) frequency 4.3 x 10 14 Hz ˂ f ˂ 7.5 x 10 14 Hz

9. Ultraviolet (UV) light wavelength 400 nm ˃ ˃ 60 nm frequency 7.5 x 10 14 Hz ˂ f ˂ 5 x 10 15 Hz Causes tanning and skin cancer

10. X rays wavelength 60 nm ˃ ˃ 10 -4 nm frequency 5 x 10 15 Hz ˂ f ˂ 3 x 10 21 Hz

11. Gamma rays shortest wavelength 0.1 nm ˃ ˃ 10 -5 nm highest frequency 3 x 10 18 Hz ˂ f ˂ 3 x 10 22 Hz Used to treat cancer

12. Light is an “inverse square” function, brightness decreases by the square of the distance. Double the distance will be 1/4 th as bright

13. Reflection Light can have diffuse or specular (regular) reflection

14. The angle of incidence = the angle of reflection

15. Image distance = Object distance

16. Images can be real or virtual Real images can be projected

17. Concave Mirrors Principal axis C, center of curvature F, focal point

18. Mirror Equation 1/p + 1/q = 1/f object distance image distance focal length

19. Magnification Equation M = h’/h = -q/p image height object height image distance object distance + M upright virtual -M inverted real