physics

Chapter 19

24. If you dip your finger repeatedly into a puddle of water, it creates waves. What happens to the wavelength if you dip your finger more frequently?

Chapter 20

29. What two physics mistakes occur in a science fiction movie that shows a distant explosion in outer space, where you see and hear the explosion at the same time?

Chapter 21

26. Tom Senior makes music by setting small columns of air into vibration by blowing across the ends of drinking straws of various lengths. Which straws, the short ones or the long ones, produce lower pitch? What would you expect of the pitch produced by the much larger musical instrument behind Tom that uses resonant air columns excited by striking the ends of the tubes with paddles?

Chapter 26

5. Which has the shorter wavelengths, ultraviolet or infrared? Which has the higher frequencies?

Chapter 27

17. On a TV screen, red, green, and blue spots of fluorescent materials are illuminated at a variety of relative intensities to produce a full spectrum of colors. What dots are activated to produce yellow? Magenta? White?

Chapter 28

7. Why is the lettering on the front of some vehicles “backward”?

Chapter 29

3. Why do radio waves diffract around buildings, while light waves do not?

Chapter 30

4. Ultraviolet light causes sunburns, whereas visible light, even of greater intensity, does not. Why is this so?

32. Cite at least two reasons for predicting that LEDs will emerge as more popular than CFLs.