C H A P T E R 16 Waves and Sound A fighter jet emerges from a cloud caused when it breaks through the sound barrier.

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Presentation transcript:

C H A P T E R 16 Waves and Sound A fighter jet emerges from a cloud caused when it breaks through the sound barrier.

The Nature of Waves Wave is a traveling disturbance. Wave carries energy from place to place. There are two basic types of waves: Transverse waves and longitudinal waves.

Transverse waves A transverse wave is one in which the disturbance is perpendicular to the direction of travel of the wave. Examples: Light wave, waves on a guitar string.

Longitudinal Waves Longitudinal wave is one in which the disturbance is parallel to the line of travel of the wave. Example: Sound wave in air is a longitudinal wave.

Water Waves Water waves are partly transverse and longitudinal.

Periodic Waves Periodic waves are waves that repeat.

Amplitude, Wavelength, and Period The amplitude, A is the maximum disturbance. The wavelength, λ is the horizontal length of one cycle of the wave. The period, T is the time required for one complete up/down cycle of the wave.

Frequency Frequency is the number of waves per unit time.

Wave Speed

Radio Waves FM vs AM: What's the difference? AM: The amplitude of the signal is varied to incorporate the sound information. Frequencies are in kHz. FM: The frequency of the carrier signal is varied to incorporate the sound information. Frequencies are in MHz.

16.3. The Speed of a Wave on a String