PPT-13.2 Sound Intensity and Resonance

pp 487 493 Mr Richter Agenda Podcast Check Questions about 131 Sound Waves Upcoming Schedule Notes Intensity and Volume Decibel levels Forced Vibrations and Resonance Upcoming Schedule. Section 8.5. Key Terms. Audible Sound Waves. Infrasonic Wave. Ultrasonic Wave. Echo. Mach Number (. M. ). Pressure (. p. ). Sound Intensity. Decibel (dB). Categories of Sound Waves. Sound waves fall into three categories covering different ranges of frequencies.. . How is sound produced, how does it travel through the air and how do we hear sounds?. Sound II. As the vocal chords vibrate, the air is alternately compressed and rarefied resulting in a longitudinal pressure wave. Physics - Arrowhead. Mr. Streufert. 2013-14. Learning Targets. Apply wave concepts to the physical and perceived characteristics of a sound wave. Perform calculations involving speed and intensity. Detect audibility and harmonic relationships. i. mpact . loud. speaker . upon. . particle. distribution in the air. sound amplitude . depends. . on. . variation. of sound . pressure. modulation. of . atmospheric. . pressure. = 100.000 Pascal. Check last week’s homework. Sound Waves – some vocab. Each . cycle. of a sound wave includes one . condensation. and one . rarefaction. The . frequency. of the sound wave is the number of cycles per second that pass by a given location. Sound Intensity, Sound Level/Loudness (Decibels), The Ear. 5.1.9. You and I are standing next to each other, listening to the exact same steady sound. . Our ears are identical. . You listen for TWICE as long as I do. More Properties of Sound. Resonance. Definition: when a force is applied to an object in repeated motion at exactly the natural frequency, an increase in amplitude occurs.. Important points: force applied AT the natural frequency!. 13.1 – Sound Waves. Objectives. * Explain how sound waves are produced. * Relate frequency to pitch. * Compare the speed of sound in various media. * Relate plane waves to spherical waves. * Recognize the Doppler effect, and determine the direction. 5.1.9. You and I are standing next to each other, listening to the exact same steady sound. . Our ears are identical. . You listen for TWICE as long as I do. How does the (average) power compare? (Please average ONLY over the time that the individual is listening!). 5.1.9. You and I are standing next to each other, listening to the exact same steady sound. . Our ears are identical. . You listen for TWICE as long as I do. How does the (average) power compare? (Please average ONLY over the time that the individual is listening!). Sound waves carry energy that can be used to do work, like forcing the eardrum to vibrate.. The energy can be great enough to cause damage to windows and buildings (sonic boom). Sound Intensity. The amount of energy transported per second by a sound wave is the . Sound. Vibrations in matter. No one need be. around to hear it.. Composed of Compressions & Rarefactions. . Compressions. are regions of high. molecular density and high pressure.. Rarefactions. Sound waves are longitudinal!. Sound can be explained by understanding:. Speed. Intensity. . and loudness. Frequency and pitch. Most people hear sound between the frequency of 20Hz and 20,000Hz. . Anatomy of Sound. This Slideshow was developed to accompany the textbook. OpenStax. Physics. Available . for free at . https://. openstaxcollege.org/textbooks/college-physics. . By . OpenStax. College and Rice University.