Waves.

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Presentation transcript:

Waves

A wave is a disturbance (or vibration) that carries energy from one point to another, but does not carry matter.

There are 3 types of mechanical waves: 1 There are 3 types of mechanical waves: 1. Transverse: particles of the medium vibrate perpendicular to the direction of the wave (ex. light, guitar strings)

2. Longitudinal: particles of the medium move parallel to the direction of the wave (ex. sound)

3. Surface: A mixture of transverse and longitudinal (ex. ocean waves) Surface waves are much more complicated and are not covered in this course!!!

Medium: What the wave travels through Crest: High point on a wave Trough: Low point on a wave Amplitude (A): Max displacement from rest Wavelength (λ = lambda): distance between two crests (or troughs)

Period and Frequency Period (T): Time it takes for one complete cycle, measured in seconds Frequency (f): Number of complete cycles per second, measured in Hertz (Hz) Frequency and Period are reciprocal, that is: f = 1 T

Ex: Playing middle C on a piano produces a sound with a frequency of 256 Hz. What is the period of the sound wave?

Remember that speed is: If we look a single wave then: the distance (d) is one wavelength (λ) the time (t) is the period ( )

This gives us the Universal Wave Equation: Where: v = wave speed (m/s) λ = wavelength (m) f = frequency (Hz)

Example: An air horn sounds at a frequency of 220 Hz Example: An air horn sounds at a frequency of 220 Hz. If the speed of sound in air is 330 m/s what is the wavelength of the sound wave?

Example: The distance between successive crests in a series of water waves is 4.0 m, and the crests travel 8.6 m in 5.0 s. Calculate the frequency of a block of wood bobbing up and down on these water waves.