Warm-Up 11/18/13 Sketch the following:

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Presentation transcript:

Warm-Up 11/18/13 Sketch the following: Transverse wave with long wavelength, and one with a short wavelength Transverse wave with high frequency, and one with a low frequency Transverse wave with high amplitude, and one with a low amplitude

Wave Properties: Speed 11-18-13

What Affects wave speed? The medium Sound is faster in liquids & solids Light is faster in gases and empty space The temperature Sound is faster in warmer temps

What affects wave speed cont. Why do you think this is? Sound waves rely on matter colliding with other bits of matter Solids/liquids have matter closer together Heat makes atoms move faster Light is not mechanical Matter blocks light waves!

Calculating Wave Speed Equation: ν=f λ ν is wave speed (velocity, m/s) f is frequency (Hz, 1/s) λ is wavelength (m)

Example What is the speed of a sound wave that has a wavelength of 2.00m and a frequency of 170.5 Hz? Identify the variables: f=170.5 Hz and λ=2.00m Plug into the equation: ν=f λ so ν=(170.5Hz)(2.00m)=(170.5 1/s)(2.00m) Solve: ν=341 m/s

QUIZ tomorrow on wave types and parts! Your Job QUIZ tomorrow on wave types and parts! Finish the “Wave Speed” section of Friday’s worksheet + 3 speed calculations. STAPLE & TURN IN TODAY. ALL STUDENTS must complete test corrections for Work, Power, and Energy. ALL STUDENTS will do a retake of corrected problems on Wednesday in class.