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Title:

Waves

Description:

Waves Longitudinal and Transverse Waves Transverse Waves on Strings Periodic Waves Reflection and Refraction of Waves Interference and Diffraction – PowerPoint PPT presentation

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Title: Waves


1
Waves
  • Longitudinal and Transverse Waves
  • Transverse Waves on Strings
  • Periodic Waves
  • Reflection and Refraction of Waves
  • Interference and Diffraction
  • Standing Waves on a String

2
??
  • ????
  • ????
  • Mechanical Waves ??
  • Electromagnetic Waves ?
  • Matter Waves ??
  • ??????
  • Transverse string wave
  • Longitudinal sound wave

3
??(Transverse Wave)
4
??(Longitudinal Wave)
5
?? ? ??
  • wavelength frequency

6
???????
  • ??(amplitude)
  • ??(phase)
  • ??(wavelength)
  • ???(angular wave number)
  • ??(period)
  • ???(angular frequency)
  • ??(frequency)

7
is used for a wave traveling in the x
direction, and is used for a wave traveling in
the x direction.
is called the wave number.
is called the phase.
Note it would also be valid to use the sine
function in the above description.
8
???? vs ????
9
????(Superposition)
10
??(Reflection)
11
??(Refraction)
12
??(Interference)
13
??(Difraction)
14
??(Standing Waves)
15
???????
  • ?????????
  • ?????????

16
??
  • Sound Waves
  • The Speed of Sound
  • Amplitude Intensity of Sound Waves
  • Standing Sound Waves
  • Beats
  • The Doppler Effect
  • Shock Waves
  • Echolocation

17
??
  • ???????????????20 Hz ????20,000 Hz.?????,??????
    20,000 Hz ?????????????????20 Hz ?????.

18
?????
  • ????,??????????????.????,????????????,?????????.??
    ????,?????????????????,??????????????????.

19
??????
????????
???????????
20
??????
???????????????????????.
21
????????? (0C, 1 atm? )
? ? ?? (m/s)
???? 259
?? 343
?? 972
?? 1284
?? 1450
? 1493
?? 1570
??? 3100
? 5790
??? 6500
22
??????
23
????????Amplitude Intensity
????
??????
24
??(Decibel)
  • ????????????????(???)????????( bel ),
    ???????(??????,?????dB).
  • ??????????????????????(?10??)????,???????? 0 dB.

25
?????
  • ??????.
  • ??????.

26
??????
  • ????????????????(??????),?????????????.

27
???? ( ??????? )
28
??????
  • ????????????,???????.???????????.

29
???? ( ??????? )
30
????
31
??(Timbre)
  • ??????????????????????????????.???????????????????
    ????.???????????,??????,??????????????(???????????
    ??).
  • ??????????????????(??????)???,?????????????(
    Fourier analysis).???,?????????????????,??????????
    ???( Fourier synthesis).

32
Flute, Oboe, Saxophone
33
?? (Loudness)
  • ???????????????,????????.???????3 ?4
    kHz?????????,??????10 kHz???800Hz???????????.

34
?????
35
?(Beats)
  • ????????(????),??????????,?????.??????????????.
  • ????????????,?????15Hz?????????????????15Hz???,??
    ?????????.
  • ??????????????????????.

36
????
????????????
37
????? (Doppler Effect)
  • ????????????,?????????????,?????????.
  • ??????,??????,??????,??????.

38
(No Transcript)
39
(No Transcript)
40
??????????
  • ?????????????,??????????,???????????.

(12-14)
?? ? ??????????,????,???,?????
41
??(Shock Waves)
  • ?????????????,?????????????????,?????.????,???????
    ,????????????.

42
(a)?????????????(b)???????????????????????????,?
??????????????(c)????????????
43
???? (Echolocation)
  • ???????????????????????.?????????,???????????.
  • ???????????????(sonar),???????????????????????.

44
????????????????????????????,????????????????
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