Sound Waves Mr Herman S Webpage-Books Pdf

Sound Waves Mr Herman s Webpage
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Slide 4 89,Characteristics of,Return to Table,of Contents. Slide 5 89,Characteristics of Sound,Sound can travel through any kind. of matter but not through a vacuum,The speed of sound is different in. different materials in general it,is slowest in gases faster in liquids. and fastest in solids,The speed depends somewhat on.
temperature especially for gases,Click here for a video on sound. waves moving in various materials,http njc tl oy,Slide 6 89. 1 Sound waves travel with the greatest velocity in. http njc tl oz,Slide 6 Answer 89, 1 Sound waves travel with the greatest velocity in. C solids C,This object is a pull tab,http njc tl oz. Slide 7 89,Characteristics of Sound, Loudness related to intensity of the sound wave as the.
volume increases the amplitude of the waves increases. Sound waves are produced by vibrations that occur,between 20 to 20 000 vibrations per second. Pitch related to frequency, Audible range about 20 Hz to 20 000 Hz upper limit. decreases with age,Ultrasound above 20 000 Hz see ultrasonic camera. focusing below,Infrasound below 20 Hz,http njc tl p0 Click here for a video on how our. vocal cords vibrate and produce sound,Slide 8 89, 2 Which of the following frequencies can be perceieved by humans.
B 1 000 Hz,C 100 000 Hz,http njc tl p1,Slide 8 Answer 89. 2 Which of the following frequencies can be perceieved by humans. B 1 000 Hz,C 100 000 Hz B,This object is a pull tab. http njc tl p1,Slide 9 89,Intensity of Sound Decibels. The intensity of a wave is the energy,transported per unit time across a. The human ear can detect sounds,with an intensity as low as 10 12.
W m2 and as high as 1 W m2,Perceived loudness however is not. proportional to the intensity,Increasing the volume of a sound. increase the displacement that the,air molecules undergo amplitude. http njc tl p2,Slide 10 89,Intensity of Sound Decibels. An increase in sound level of 3,dB which is a doubling in.
intensity is a very small,change in loudness,In open areas the intensity of. sound diminishes with, However in enclosed spaces this is complicated byreflections. and if sound travels through air the higherfrequencies get. preferentially absorbed,http njc tl p2,Slide 11 89. 3 Doubling the distance from a sound source will change the intensity. volume by a factor of the original value,http njc tl p3. Slide 11 Answer 89, 3 Doubling the distance from a sound source will change the intensity.
volume by a factor of the original value,This object is a pull tab. http njc tl p3,Slide 12 89, 4 As you walk toward a sound source the volume will. A increase,B decrease,C will not change,http njc tl p4. Slide 12 Answer 89, 4 As you walk toward a sound source the volume will. A increase,B decrease,C will not change A,This object is a pull tab.
http njc tl p4,Slide 13 89, 5 Reducing the distance from a sound source to one half the original. value will change the intensity volume by what factor. http njc tl p5,Slide 13 Answer 89, 5 Reducing the distance from a sound source to one half the original. value will change the intensity volume by what factor. This object is a pull tab,http njc tl p5,Slide 14 89. 6 Cutting the distance from a sound source by a factor of 1 3 will. change the intensity volume by a factor of the original value. http njc tl p6,Slide 14 Answer 89, 6 Cutting the distance from a sound source by a factor of 1 3 will. change the intensity volume by a factor of the original value. This object is a pull tab,http njc tl p6,Slide 15 89.
7 You and a friend are on opposite sides of the gym when your friend. says something to you You cannot hear him Your friend says the. same thing again only louder and you hear it What is different. about the sound wave the second time he says it, A The second sound wave reflects more off the walls of the. B The air molecules disturbed by the second sound wave we. more closely spaced to begin with, C The second sound wave traveled more quickly to you. D The molecules disturbed by the second sound wave have a. greater amplitude,Slide 15 Answer 89, 7 You and a friend are on opposite sides of the gym when your friend. says something to you You cannot hear him Your friend says the. same thing again only louder and you hear it What is different. about the sound wave the second time he says it, A The second sound wave reflects more off the walls of the. B The air molecules disturbed by the second,more closely spaced to begin with.
D sound wave we, C The second sound wave traveled more quickly to you. D The molecules disturbed by the second sound wave have a. greater amplitude,This object is a pull tab,Slide 16 89. The Ear and Its Response Loudness,http njc tl p7,Slide 17 89. The Ear and Its Response Loudness, Outer ear sound waves travel down the ear canal to the. eardrum which vibrates in response, Middle ear hammer anvil and stirrup transfer vibrations.
to inner ear, Inner ear cochlea transforms vibrational energy to. electrical energy and sends signals to the brain,Click here for a video on hearing. http njc tl p7,Slide 18 89,The Ear and its Response Loudness. The ear s sensitivity varies with frequency, These curves translate the intensity into sound level at. different frequencies,http njc tl p7,Slide 19 89,Sources of Sound.
Return to Table,of Contents,Slide 20 89,Sources of Sound. Vibrating Strings and Air Columns, Musical instruments produce sounds in various ways. vibrating strings vibrating membranes vibrating metal or. wood shapes vibrating air columns,The vibration may be started by plucking striking. bowing or blowing The vibrations are transmitted to the. air and then to our ears,http njc tl p8,Slide 21 89. Sources of Sound Vibrating Strings and,Air Columns.
The strings on a guitar can,be effectively shortened by. fingering raising the,fundamental pitch,The pitch of a string of a given. length can also be,altered by using a string of,different density. Click here for a video on,guitar string pitch,http njc tl p8. Slide 22 89,Sources of Sound,Vibrating Strings and Air Columns.
A piano uses both,methods to cover its,more than seven octave. range the lower strings,at bottom are both,much longer and much. thicker than the higher,http njc tl p8,Slide 23 89. Sources of Sound,Vibrating Strings and Air Columns. Length Pitch,A piano uses both,methods to cover its.
more than seven octave,range the lower strings,at bottom are both. much longer and much,thicker than the higher,The product of length and pitch is a constant. Observe relationship between,wavelength and frequency. http njc tl p8,Sources of Sound Slide 24 89,Vibrating Strings and Air Columns. Wind instruments create,sound through,standing waves in a.
column of air,Click here for a video on,sound in air columns. http njc tl p8,Slide 25 89,Open Tubes,Return to Table. of Contents,Slide 26 89,Sources of Sound,Vibrating Strings and Air Columns. A tube open at both ends most wind instruments has pressure. nodes and therefore displacement antinodes at the ends. http njc tl p8,Slide 27 89,Sources of Sound Open Tubes. The general equation for the wavelength of an open tube is. Where n is the number of nodes,Sources of Sound Slide 28 89.
Vibrating Strings and Air Columns, If instead of air displacement you look at air pressure variation the. nodes and antinodes are switched,Slide 29 89,Sources of Sound. Vibrating Strings and Air Columns, An open tube has the same harmonic structure as a string. Slide 30 89, 8 A sound wave resonates in a tube of length 2m withtwo open. ends What is the wavelength of the lowest resonating frequency. of the tube,http njc tl pa,Slide 30 Answer 89, 8 A sound wave resonates in a tube of length 2m withtwo open.
ends What is the wavelength of the lowest resonating frequency. of the tube,This object is a pull tab,http njc tl pa. Slide 31 89, 9 A sound wave resonates in a tube of length 2m withtwo open. ends What is the lowest resonating frequency of the tube if the. speed of sound in air is 340m s,http njc tl pb,Slide 31 Answer 89. 9 A sound wave resonates in a tube of length 2m withtwo open. ends What is the lowest resonating frequency of the tube if the. speed of sound in air is 340m s,This object is a pull tab. http njc tl pb,Slide 32 89, 10 A sound wave resonates in a tube of length 6m withtwo open.
ends What is the wavelength of the lowest resonating frequency. of the tube,http njc tl pb,Slide 32 Answer 89, 10 A sound wave resonates in a tube of length 6m withtwo open. ends What is the wavelength of the lowest resonating frequency. of the tube,This object is a pull tab,http njc tl pb. Slide 33 89, 11 A sound wave resonates in a tube of length 6m withtwo open. ends What is the lowest resonating frequency of the tube if the. speed of sound in air is 340m s,http njc tl pc,Slide 33 Answer 89. Slide 34 89,Closed Tubes,Return to Table,of Contents.


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