Section 2 – Properties of Waves pp

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Section 2 – Properties of Waves pp. 580 - 583 The Energy of Waves Section 2 – Properties of Waves pp. 580 - 583

PROPERTIES OF WAVES Amplitude Wavelength Frequency Wave speed

TERMS TO LEARN Amplitude – the maximum distance a wave vibrates from its resting position Resting position – where the particles of a medium stay when there are no disturbances

TERMS TO LEARN Wavelength – the distance between one point on one wave to the same point on the next wave Frequency – the number of waves produced in a certain amount of time Wave speed – the speed at which a wave travels

AMPLITUDE Distance where the greatest movement from rest occurs. The larger the amplitude is, the taller the wave is and the more energy it has The smaller the amplitude, the shorter the wave is and the less energy it has.

AMPLITUDE Amplitude of a transverse wave is measured from the resting position to the crest or resting position to trough.

WAVELENGTH On a transverse wave, wavelength is the distance between two adjacent crests, troughs or any one point on one wave to the corresponding point on the next wave.

WAVELENGTH On a longitudinal wave, wavelength is the distance between two adjacent compressions, rarefactions or any one point on one wave to the corresponding point on the next wave.

WAVELENGTH Wavelength is measured in meters The symbol for wavelength is λ

FREQUENCY Frequency is the number of complete waves (or cycles) produced in a specific unit of time. Frequency is measured in Hertz (Hz). 1 Hz = 1 cycle/second 1 Hz = 1/s

FREQUENCY For a transverse wave, count the number of crests or troughs that pass a point in a given amount of time. For a longitudinal wave, count the number of compressions or rarefactions that pass a point in a given amount of time.

FREQUENCY The frequency of a wave is related to its wavelength. At a given speed, the higher the frequency of the wave, the shorter the wavelength is.

WAVE SPEED Found by measuring the distance a single crest (or compression) travels in a given amount of time. Wave speed depends on the medium through which the wave is traveling. (Ex.: speed of sound in air = 340 m/s; speed of sound in steel = 5200 m/s)

WAVE SPEED Formula for calculating wave speed: v= f λ v = speed (measured in m/s) f = frequency (measured in Hz) λ = wavelength (measured in m)