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Presentation transcript:

Learning Goal Identify two major types of waves. CrestCrest TroughTrough CompressionCompression RarefactionRarefaction WavelengthWavelength AmplitudeAmplitude FrequencyFrequency Period Period VelocityVelocity MediumMedium PropagationPropagation Define the following terms: Find a relationship between Velocity, Frequency and Wavelength. Understand what results when two or more waves are at the same place at the same time.

Water Wave The bottom of the wave “drags” against the shore, and the top of the wave falls over.

Low Pressure Low Pressure Fast Fast Bernoulli’s Principle What makes waves?

Bernoulli’s Principle What makes waves?

Propagation ≡ The process of spreading out into a larger area. The process by which electromagnetic waves or sound wave are transmitted through a medium. Medium ≡ The material the wave moves through

Longitudinal Wave Transverse Wave Wave Motion Wave Motion Particles in the medium vibrate PERPENDICULAR to the wave motion. Particles in the medium vibrate PARALLEL to the wave motion.

Wavelength Crest Crest Trough Trough Wavelength Wavelength Amplitude Transverse Wave

Wavelength Compression Wavelength Rarefaction Longitudinal Wave Small Amplitude Large Amplitude

= Wavelength λ (meters) Wavelength λ

λ= Wavelength λ = Wavelength = 4.3 cm

λ= Wavelength λ = Wavelength = 17.1 cm

PERIOD ≡ The time it takes for one wave to pass. (one complete cycle) seconds wave

FREQUENCY ≡ The number of waves that pass a given point each second. waves second (Hertz) f = 1 Hz

Transverse Wave FREQUENCY ≡ The number of waves that pass a given point each second. (1 Hertz) wave second 1

Longitudinal Wave FREQUENCY ≡ The number of waves that pass a given point each second. (1 Hertz) wave second 1

FREQUENCY ≡ The number of waves that pass a given point each second. waves second (Hertz) f = 2 Hz

FREQUENCY ≡ The number of waves that pass a given point each second. waves second (Hertz) f = ½ Hz

Frequency = waves seconds Period = seconds wave Period = 1 Frequency Frequency = 1 Period Period = 10 seconds Frequency = 0.1 Hertz Period =.02 seconds Frequency = 50 Hertz

23 cars in 16.5 seconds = 1.4 cars/second Each car is 10.5 meters long. 1.4 cars second · 10.5 meters car = 14.7 meters second How fast is the train moving?

Velocity = Frequency · Wavelength v = f · λλ waves second meters wave.

v = f · λ The velocity (for a given type of wave) is constant! FREQUENCY is inversely proportional to WAVELENGTH

λ = 2.5 cm Three waves go by the pencil every second. ( f = 3 Hz ) Find the wave velocity!

FM (Frequency Modulated) AM (Amplitude Modulated) ?

frequency = MHz (105,500,000 Hz) What is the wavelength of the signal? Velocity light = 3 x 10 8 m/s = 300,000,000 m/s v = f · λ λ = 2.84 meters megahertz UNITS? UNITS?