19. Physical Properties of Waves Short wavelength=high frequency (bluish colors, high-pitched sounds) Long wavelength=low frequency (reddish colors, low-pitched sounds) Great amplitude (bright colors, loud sounds) Small amplitude (dull colors, soft sounds)
20.
21. How safe is your iPod? 5 minutes 95% level 90 minutes per day 80% level 4.6 hours per day 70% level Safe listening time iPod sound level