waves, light, sound and color waves transfer energy through matter or space
TRANSCRIPT
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Waves, Light, Sound and Waves, Light, Sound and ColorColor
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WavesWaves
Transfer energy through Transfer energy through matter or spacematter or space
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WavesWaves
May be longitudinalMay be longitudinal
Or transverseOr transverse
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WavesWaves
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Waves travel through a medium Waves travel through a medium such as:such as:
water
air
solids
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Wave PropertiesWave Properties
reflection
refraction
interference
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Wave PropertiesWave Properties
Diffraction: the Diffraction: the bending of a bending of a wave around the wave around the edge of a barrier.edge of a barrier.
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Reflection, refraction, diffraction Reflection, refraction, diffraction and interferenceand interference
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Sound wavesSound waves
Longitudinal wavesLongitudinal waves
Need a medium to travel throughNeed a medium to travel through Speed of sound is 340 m/s in airSpeed of sound is 340 m/s in air
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Water wavesWater waves
Water waves have transverse and longitudinal characteristics.Energy is transferred, but the particles stay essentially in the same place
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Light: particle or wave?Light: particle or wave?
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Light particles are called photonsLight particles are called photons
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Light: Particle or wave?Light: Particle or wave?
BOTH!!BOTH!! Light does not need a medium to travel Light does not need a medium to travel
through.through.
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Doppler effectDoppler effect
Change in Change in frequency frequency and and pitchpitch of a of a sound. sound.
Due to the Due to the motionmotion of either the sound of either the sound source or the observer.source or the observer.
Listen!Listen!
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Doppler effect of soundDoppler effect of sound
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Doppler effect in lightDoppler effect in light
As stars move away from earth, As stars move away from earth, there is a shift in the light towards there is a shift in the light towards the red end of the spectrum.the red end of the spectrum.
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Color• When light strikes a surface, it can
be transmitted, absorbed, or reflected
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Transmission of light• When light is transmitted, a
substance is said to be transparent.
• The color that is transmitted is the color that reaches your eye.
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Transparent objects transmit color
• Red glass absorbs all colors of light except red, which it transmits.
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Absorption of light
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Reflection and absorption of light
• Opaque objects reflect and absorb light.
• The color of an opaque object is the color it reflects.
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Opaque objects reflect and absorb light
• This apple reflects red and absorbs all other colors.
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Translucent objects transmit some light
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Color• Primary colors are red, green
and blue.• Primary colors may be
combined to make white light.
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Complimentary colors• 2 colors that combine to form
white light.
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Primary colors of light together form white light. But primary pigments together make black.
This is because they absorb all colors.
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Bye-bye!