PPT-L6 and L7 Sound Intensity, Sound Level/Loudness (Decibels), The Ear

519 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. 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.. Nature of the Sound Stimulus. “Sound”. . is the rhythmic compression and decompression of the air around us caused by a vibrating object.. Applet. Applet2. Sound Wave:. Amplitude and Frequency (Hz). 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. What are the properties of sound waves?. My Top 5 List of. “Unpleasant” Sounds. Record in your journal a top 5 list of sounds that are “unpleasant” to you. . What do you think causes a sound to be unpleasant?. 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!. Sound is a compression wave - it only “looks” like a wave if we plot air pressure against time. time ->. Air Pressure. Period - amount of time for one cycle. Frequency = number of cycles per second (1/Period). 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 . phon. , and is arrived at by reference to equal-loudness contours. By definition two sine waves, of differing frequencies, are said to have equal-loudness level measured in phons if they appear equally loud to the average young person without significant hearing impairment.. 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 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 . 20. th. Feb 2019. Review: the . visual pathway. Pathway begins at the physical apparatus of the eye. Works its way through connecting nerves. Lateral geniculate nucleus (LGN) is an important junction .