Sound & Sound WavesSound Sound is a longitudinal wave created by vibrations, the back-and-forth motion of an object. Longitudinal waves are made up of compressions and rarefactions and can only travel through a medium. Waves that must have a medium to transfer energy are called mechanical waves. The medium can be a solid, liquid, or gas. If there is no medium, such as in a vacuum, then the energy of sound will not be transferred. Compression Rarefaction Compressionwavelengthair = mediummechanical wavessound - longitudinal wavesouter space is a vacuumno sound can be transferredEarth’satmospheresoundis transferredthrough airIn the vacuum of outer space, an astronaut cannot hear any sounds when he is outside his spaceship. On Earth the air around us transfers sounds to our ears. We hear sound when the disturbance in the air reaches our ears.echoToday’s Lesson Mondayabcdefghijklmnopqrstuvwxyzdiffraction© Copyright NewPath Learning. All Rights Reserved. 94-4468Visit www.newpathlearning.com for Online Learning Resources.Wave Interactions & SoundWe call the of sound an echo. We do not always hear an echo but sound off any barrier. We also know sound diffracts. If people are talking in the hallway we can hear them in the class room because sound diffracts around the opening of the doorway. reflectionSound is a longitudinal wave created by vibrations, the back-and-forth motion of an object. Longitudinal waves are made up of compressions and rarefactions andcan only travel through a medium. Wavesthat must have a medium to transfer energy are called mechanical waves. The medium can be a solid, liquid, or gas. If there is no medium, such as in a vacuum, then the energy of sound will not be transferred. Coomsiooooooooooooooonnnnnnnnpressssssssssssssssssssssssmpnnnnnnn RaareefannnnnnnnnccccccccccctttttttttttttttttioooooonnnnnnnnnnnnnnfaaaaacccccccccCoomppressComsssssiiiiiiionsssssioawaaveleeeeeeeeeeeeeeeeeeeennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnvgthnnnnga = medddiuaaaaaaaaaaaaaaaaaaaaaiiiiiiiiiiiiiiiirrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr = memedddiumam dddddddddddddddiummeeeddddddddddddddiumcccaammmmmmmmmmmmmmmmmmmmmmmmmmeeeeeeeeeeeeeeeeeeeeeecccccccccccmmmmmmmmmmmmmmhhhhhhhhhhhhhhhhhhhhaaaaaaaaaaaaaaaaaaannnnnnnnnnnnnnnnnnnnnnnnniiiiiiiiiiiiiiiiiiiiccccccccccaachaaaaaaaaaaaaaaallllllllllllllll cccaaaaaaaaaaaaaaaaaaaa waveesssssaaaaaaaaaaaaaaaaaaallllllllllllllll d ssounndsoongd - lod gitttttttttttttttttttttttuuuuuuuuuuuuuuuuuuuuuuddddddddddddddddddddddingiddiiiiiidddiiiiiiiiiiiinnnnnnnnnnnnnnnnnnaaaaaaadddddddddddddddddddiiiiiiiiiiiwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwawwwwwwwwwwwwwwwwwwavessouteeeeeeeeeeeeerrrrrrrrrrrr sssssssppppaccccccceeeeeeeeeeeeeeeee is aaaaaaaaaaaaaaa vvvvvvvvvvvvaacccccccccccuuuuuuuuuuuuuuuuuuuuuuuuuuuuummmmmmmmmno sound can bee tttttttttttttttttttrrrrrrrrrrrrrraaaaaaaaaaaaansssssssssssfffffffffffffffffeeeeeeeeeeeeeeerrrrrrrrrredddddddddddrrrrrrrrrEarth’satmospheresoundis transferredthrough airIn the vacuum of outer sppppppppppaaaaaaaaccccccccceeeeeeeeee,,,, aaaaaaaaaaaaannnnnnnnnnnnn aaaaaaaaaaaaassssssssssssttttttttttrrrrrrrrrrooooonaut ccccccaaaaaaaaaannnnnnnnnnnnnnnnnnnnnnnnoooooooooootttttttttttt hhhhhhhhhhhhhhhhhhhhhhhheeeeeeeeeeeear aaaaaaannnnnnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyy sssssoooooooooooouuuuuuuuuuuuuuuuuunnnnnnnnnnnnnnnnnnndddddddssss wwwwwwwwwwwwwwwwwwhhhhhhhhhhhhhhhhhhhhen he is outside his spaceship. On Earth the air around us transfers souuuuuunnnnnnnnnnnnnnndddddddds tooooooo oooooooooooouuuuuuuuuuuuuurrrrrrrrrrrr eeeeeeeeeeeeeeeeaaaaaaaaaaaaarrrrrrrrrrrrssssssssss. WWWWWWWWWWWWWe hhhhhhhhhear soundddddddddd wwwwwwwwwwwwwwwwwwhhhhhhhhhhhhhhhhhhheeeeeeeeeeeeeennnnnnnnnnnnnnnn tttttttttttttttttttthhhhhhhhhhhhhhhhhhhhhhhhhe dddddddddddddddddiiiiiiiiiiiiiiiisssssssssttttttttttttttturbance in the air reaches our ears.echoToday’s MondayabcdefghijklmnopqrstuvwxyzLessonhijklmnopqdiffractionrrWe call the ooof sooooooooooooouuuuuuuuuuuuuuuuuuunnnnnnnnnnnnnnnd aaaaaannnnnnnnnnnnnnnnnnn eeeeeeeeeecho. We do nnnnnnnnnnnnnnnnooooooooooooottttttttttttt aaaaaaaaaaaaaalllllllllllwwwwwwwwwwayss hhhhhhhhhhhhhhhhhheeeeeeeeeeeeeeaaaaaaaaar an echo but sound off any barrier. We also know sound dddddiiiiiiiiiiiiiiffffffffffffffffffffraaaaaaaaaaaacccccccccccccttttttts.... IIIIIIIIIIIIffffffffff pppppppppeopppppppppppplllllllllllleeeeeeeeeeeeeee aaaaaaaare ttttttttttttttaaaaaaaaaaaaaaaalllllllllkkkkkkkkking in thhhhhhhhhhheeeeeeeeeee hhhhhhhhhhhhhhhhaaaaaaaaaallllllllllllllllwwwwwwwwwwwwwwwwaaaaaaaaaaaaaayyyyyyyyyyyyyyyyyyyyy wwwwwwwwwwwwwe can hear them in the class room because sound diffractsaround the oopppppppppppppppppeeeeennniiiiiiiiiiiiiiinnnnnnnnnnnnnnnnggggggggggggg ooooooooooooooooffffffffffffff tthhhhhhhhheeeeeeeeeeee dddddddddddddoooooooooorwaaaaaaaaaaaaaaayyyyyyyyyyyyyyyyy.. ecttttttttttiiiiiiioooooooooooooooooooonnnnnnnnnnnnnnnefleretireflect
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