Learning Objectives By the end of this section, you will be able to: Figure 18.3 Borneo amber was mined in Sabah, Malaysia, from shale-sandstone-mudstone veins. When a piece of amber is rubbed with a piece of silk, the amber gains more electrons,…
Figure 18.1 Static electricity from this plastic slide causes the child’s hair to stand on end. The sliding motion stripped electrons away from the child’s body, leaving an excess of positive charges, which repel each other along each strand of hair. (credit:…
Sound Speed of Sound, Frequency, and Wavelength The relationship of the speed of sound vwvw, its frequency ff, and its wavelength λλ is given by vw=fλ,vw=fλ, which is the same relationship given for all waves. In air, the speed of sound is related to…
Learning Objectives By the end of this section, you will be able to: Figure 17.40 Ultrasound is used in medicine to painlessly and noninvasively monitor patient health and diagnose a wide range of disorders. (credit: abbybatchelder, Flickr) Any sound with a frequency…
Learning Objectives By the end of this section, you will be able to: Figure 17.33 Hearing allows these vocalists, the band, and the fans to enjoy music. (credit: Reggie Mathalone, CC BY) The human ear has a tremendous range and sensitivity. It…
Learning Objectives By the end of this section, you will be able to: Figure 17.20 Some types of headphones use the phenomena of constructive and destructive interference to cancel out outside noises. (credit: JVC America, Flickr) Interference is the hallmark of waves,…
Learning Objectives By the end of this section, you will be able to: The characteristic sound of a motorcycle buzzing by is an example of the Doppler effect. The high-pitch scream shifts dramatically to a lower-pitch roar as the motorcycle passes…
Learning Objectives By the end of this section, you will be able to: Figure 17.11 Noise on crowded roadways like this one in Delhi makes it hard to hear others unless they shout. (credit: Lingaraj G J, Flickr) In a quiet forest,…
Learning Objectives By the end of this section, you will be able to: Figure 17.7 When a firework explodes, the light energy is perceived before the sound energy. Sound travels more slowly than light does. (credit: Dominic Alves, Flickr) Sound, like all…
Learning Objectives By the end of this section, you will be able to: Figure 17.2 This glass has been shattered by a high-intensity sound wave of the same frequency as the resonant frequency of the glass. While the sound is not visible,…