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p5 (refraction (waves travel at different speeds in materials with…
p5
refraction
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frequency of wave stays the same, so wavelength changes, decreases if it slows down and increases if it speeds up
slows down, bends to normal
speeds up, bends away from normal
sound travels faster in denser material, from water to air, wavelength increases
EM waves travel slower in denser material, from air to glass wavelength decreases, would bend to normal
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reflection
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measured from the normal
imaginary line at right angles to the surface at the point the light hits it
reflection of visible light is what let's us see things, light bounces off objects into eyes
light rays reflect off smooth surfaces all in the same direction, giving a clear reflection
reflects off rough surfaces, each ray hits at a different angle, scatters
white light is a mixture of all different colours of light, all different wavelengths
white light doesn't split into different colours when it reflects, all wavelengths follow the rule
wave basics
travel through a medium
particles of the medium vibrate and transfer energy between each other
particles stay in the same place
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measure speed of sound
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start with both microphones next to the speaker, then slowly move one away until two waves are aligned on display but are exactly one wavelength apart
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use formula to find speed of sound waves passing though the air, set frequency on signal generator
transverse
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travel on surface of a liquid, not through
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ripple tank
frequency
float cork in tank, should bob
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boundaries
absorbed, transfers energy to material's energy stores
transmitted, carries on travelling often at different speed which can lead to refraction
reflect, incoming ray is sent back