waves
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Waves transfer energy without transferring… They’re described as… about a fixed point
matter oscillations
What are transverse waves?
Waves where the points oscillate along its length to vibrate at 90 degrees to direction of energy transfer.
What are the properties of transverse waves?
• energy transfer perpendicular to wave motion • transfer energy but not particles • can move in solids, surface of liquids & vacuums
What are longitudinal waves?
Waves where the points along its length oscillate parallel to direction of energy transfer.
What are the properties of longitudinal waves?
• energy transfer in same direction as wave motion • transfer energy but not particles • can move in solids, liquids & gases, not in a vacuum
What’s the formula for frequency?
F = 1/t
What are the 2 formulas for wave speed?
S=D/T V = f x λ
What is the method for measuring waves?
• set up ripple tank • place paper under ripple tank to catch shadows • mark 2 lines on paper 15cm apart • record waves passing through over 5 seconds with slow mo camera + measure how long each λ is in m • calculate wave speed by recording time it takes 1 wave to pass 15cm • calculate frequency using v = f x λ
When waves move from one substance to another they may be…
transmitted absorbed reflected refracted
How does density affect the change of direction in refraction?
• less to more dense (light bends towards the normal) • more to less dense (light bends away from the normal) • when passing along normal light doesn’t bend at all
Why will waves have a change of speed in refraction?
When a wave hits a different medium the different parts of the wave enter at different times.