College Physics

Figure 17.45(a) An ultrasonic image is produced by sweeping the ultrasonic beam across the area of interest, in this case the wo ...

Because an echo is involved, there is actually a double shift. The first occurs because the reflector (say a fetal heart) is a m ...

Solution for (a) (1) Identify knowns: The blood is a moving observer, and so the frequency it receives is given by (17.43) fob ...

acoustic impedance: antinode: bow wake: Doppler effect: Doppler shift: Doppler-shifted ultrasound: fundamental: harmonics: heari ...

Sound is one type of wave. Hearing is the perception of sound. 17.2 Speed of Sound, Frequency, and Wavelength The relationship ...

17.7 Ultrasound The acoustic impedance is defined as: Z=ρv, ρis the density of a medium through which the sound travels andvis ...

Problems & Exercises 17.2 Speed of Sound, Frequency, and Wavelength 1.When poked by a spear, an operatic soprano lets out a ...

34.A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s. (a) An observer waiting at ...

intense sounds to avoid further damage to her hearing from levels above 90 dB. 67.(a) What is the intensity in watts per meter s ...

628 CHAPTER 17 | PHYSICS OF HEARING This content is available for free at http://cnx.org/content/col11406/1.7 ...

18 ELECTRIC CHARGE AND ELECTRIC FIELD Figure 18.1Static electricity from this plastic slide causes the child’s hair to stand on ...

19 Electric Potential and Electric Field The image of American politician and scientist Benjamin Franklin (1706–1790) flying a k ...

18.1 Static Electricity and Charge: Conservation of Charge Figure 18.3Borneo amber was mined in Sabah, Malaysia, from shale-sand ...

Figure 18.5This simplified (and not to scale) view of an atom is called the planetary model of the atom. Negative electrons orbi ...

Figure 18.6When this person touches a Van de Graaff generator, she receives an excess of positive charge, causing her hair to st ...

Figure 18.8When materials are rubbed together, charges can be separated, particularly if one material has a greater affinity for ...

Figure 18.9(a) When enough energy is present, it can be converted into matter. Here the matter created is an electron–antielectr ...

Other substances, such as glass, do not allow charges to move through them. These are calledinsulators. Electrons and ions in in ...

Figure 18.13Charging by induction. (a) Two uncharged or neutral metal spheres are in contact with each other but insulated from ...

Figure 18.15Both positive and negative objects attract a neutral object by polarizing its molecules. (a) A positive object broug ...