PPT-Sound Intensity - decibels

Check last weeks 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. Class 2 – Outline:. Waves in 2-D and 3-D. Spherical waves and plane waves. Index of Refraction. Power, Intensity and. . Decibels. The Doppler Effect. Last Time. Mechanical Waves: waves that require a medium. 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. pp. 487 - 493. Mr. Richter. Agenda. Podcast Check. Questions about 13.1 Sound Waves. Upcoming Schedule. Notes:. Intensity and Volume. Decibel levels. Forced Vibrations and Resonance. Upcoming Schedule. 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. www.sciencebuddies.org. Reflected. Absorbed. Transmitted. Sound waves. Sound levels are measured in . decibels. (abbreviated dB). Long-term exposure causes hearing damage. Immediate hearing damage. Decibels are a . 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!). Properties:. . Numbers:. . Sound intensity and power. Intensity:. P. – power (do not confuse with pressure). E . - . energy. t . - time. Free field (radiation is uniform in all directions):. r . 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 . Section 6.5 Beginning on page 327. Properties. Because logarithms are the inverse functions of the exponential functions, properties of logarithms are similar to properties of exponents. . Product Property:. 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. The threat of noise pollution is increasing with the . rapid pace of urbanization and industrialization. . Unwanted sounds not only cause . discomfort and irritability . to animals but can also lead to .