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Representing waves презентация
Содержание
- 1. Representing waves
- 2. Representing waves There are two ways we can represent a wave in a graph;
- 3. Displacement/time graph This looks at the movement
- 4. Displacement/time graph This looks at the movement
- 5. Displacement/time graph This looks at the movement
- 6. Displacement/time graph This looks at the movement
- 7. Displacement/distance graph This is a “snapshot” of
- 8. Displacement/distance graph This is a “snapshot” of
- 9. Displacement/distance graph This is a “snapshot” of
- 10. Displacement/distance graph This is a “snapshot” of
- 11. Wave intensity
- 12. Wave intensity This is defined as the
- 13. Wave intensity For example, imagine a window
- 14. Intensity at a distance from a light
- 15. Intensity at a distance from a light source I = P/4πd2 d
- 16. Sound intensity The lowest intensity that can
- 17. Intensity and amplitude
- 18. Intensity and amplitude The intensity of a
- 19. Intensity and amplitude This means if you
- 20. Surfers know this!
- 21. Let’s try some more questions!
Representing waves There are two ways we can represent a wave in a graph;
Слайд 3Displacement/time graph
This looks at the movement of one point of the
wave over a period of time
1
Слайд 4Displacement/time graph
This looks at the movement of one point of the
wave over a period of time
1
PERIOD
Слайд 5Displacement/time graph
This looks at the movement of one point of the
wave over a period of time
1
PERIOD
Слайд 6Displacement/time graph
This looks at the movement of one point of the
wave over a period of time
1
PERIOD
IMPORTANT NOTE: This wave could be either transverse or longitudnal
Слайд 7Displacement/distance graph
This is a “snapshot” of the wave at a particular
moment
1
Distance cm
-1
-2
0.4
0.8
1.2
1.6
displacement
cm
Слайд 8Displacement/distance graph
This is a “snapshot” of the wave at a particular
moment
1
Distance cm
-1
-2
0.4
0.8
1.2
1.6
displacement
cm
WAVELENGTH
Слайд 9Displacement/distance graph
This is a “snapshot” of the wave at a particular
moment
1
Distance cm
-1
-2
0.4
0.8
1.2
1.6
displacement
cm
WAVELENGTH
Слайд 10Displacement/distance graph
This is a “snapshot” of the wave at a particular
moment
1
Distance cm
-1
-2
0.4
0.8
1.2
1.6
displacement
cm
WAVELENGTH
IMPORTANT NOTE: This wave could also be either transverse or longitudnal
Слайд 12Wave intensity
This is defined as the amount of energy per unit
time flowing through unit area
It is normally measured in W.m-2
It is normally measured in W.m-2
Слайд 13Wave intensity
For example, imagine a window with an area of 1m2.
If one joule of light energy flows through that window every second we say the light intensity is 1 W.m-2.
Слайд 14Intensity at a distance from a light source
I = P/4πd2
where d
is the distance from the light source (in m) and P is the power of the light source(in W)
Слайд 16Sound intensity
The lowest intensity that can normally be heard by a
human ear is 1 x 10-12 W.m-2
This is a sound intensity level of 0 dB
This is a sound intensity level of 0 dB
Слайд 18Intensity and amplitude
The intensity of a wave is proportional to the
square of its amplitude
I α a2
(or I = ka2)
I α a2
(or I = ka2)
Слайд 19Intensity and amplitude
This means if you double the amplitude of a
wave, its intensity quadruples!
I = ka2
If amplitude = 2a,
new intensity = k(2a)2
new intensity = 4ka2
I = ka2
If amplitude = 2a,
new intensity = k(2a)2
new intensity = 4ka2
