Science w/ Ms. Hendryx 1/17/12. 1.Felectric= 2.PEelectric= 3.C = 4.Power Law: P = 5.Ohm’s Law: V =

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Presentation transcript:

Science w/ Ms. Hendryx 1/17/12

1.Felectric= 2.PEelectric= 3.C = 4.Power Law: P = 5.Ohm’s Law: V =

VOCABULARY: Wavelength, λ Period, T Frequency, f Wave velocity, v Index of refraction, n Superposition Speed of Light, c Distance between similar points on a wave [m] The time it takes for a wave to travel a full wavelength (sec) Velocity of a point on a wave (m/s) How much slower light travels in a material than in vacuum CONSTANT! 3 x 10 8 m/s Addition of wave amplitudes; results in INTERFERENCE How often a wave repeats [Hertz, Hz=1/s]

Frequency: 1/T (depends on wave source)

What do we know about waves? AmplitudePeak Trough

Water waves Sound waves Light waves

Superposition: Waves add! destructive interference What if the amplitudes aren’t the same? What if the waves don’t match up perfectly? Does the frequency change? (shifted by ½)

Superposition: Waves add!

rArA rBrB

What if the waves don’t have the same frequency?

Tuning: If notes aren’t in tune, you hear interference as beats. You want the beat frequency as low as possible.

Superposition: Waves add! What if the waves don’t have the same frequency? As it turns out, the frequency of the beats is the DIFFERENCE between the 2 wave frequencies! The note A has a frequency of 440 Hz. What is the frequency of the A on my oboe if you can hear a 2 Hz beat? sharp or flat…

700 nm 400 nm The colors you see are constructively interfering. Different thicknesses mean different wavelengths will constructively interfere.