Frequency Higher frequency = high sound = More waves = shorter wavelength Low frequency = Low sound =Less waves= longer wavelength.

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Presentation transcript:

Frequency Higher frequency = high sound = More waves = shorter wavelength Low frequency = Low sound =Less waves= longer wavelength

Period of a Wave The period is the duration of one cycle in a repeating event. Frequency is a measure of the number of occurrences of a repeating event per unit time.

Vibrations Sound is caused by vibrations Sound requires a medium (does not happen in outer space since it is a vacuum.) Sound will travel through water at 20 degrees Celsius slower than water at 80 degrees Celsius.

Energy The amount of energy a wave has determines it’s amplitude.

Sound The unit used to measure sound intensity is the decibel. Pitch is how high or low a sound seems to be. When a person moves toward a sound, the compressions of the wave are pushed together.

Frequency The frequency at which a string vibrates is its natural frequency The frequencies of an instrument’s tone that are multiples of the fundamental frequency are overtones.

Instruments Brass and wind instruments make sounds by vibrating a column of air. Beats are produced by 2 sound with different frequencies

FM FM broadcasting is a broadcast technology invented by Edwin Howard Armstrong FM carrier wave frequencies vary from 88 Mhz to 108 Mhz FM = Frequency Modulation

Radio Each radio station broadcasts on one frequency called a carrier wave. Information can be added to a radio carrier wave by frequency modulation and amplitude modulation.

Sound Violins, harps, and guitars produce sound by vibrating strings. A flute player changes the length of a column of air by opening and closing holes which helps make each different sound.

Formulas

Formula Practice The frequency is 30. What is the period of the wave. 1/30 The period is 10, what is the frequency of the wave? 1/10