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Sound wave






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    Sound wave Sound wave Presentation Transcript

    • Chapter 2 Sound Subject : Physics Teacher : Piyanuch Plaon
    • Sound Energy is transferred from particle to particle through matter. How we hear?
    • Video about How we Hear?
    • How we hear? a. Outer ear collects sound. b. Middle ear amplifies sound. c. Inner ear
    • Longitudinal Wave ( ) wave particles vibrate back and forth along the path that the wave travels.
    • Transverse waves ( ) wave particles vibrate in an up- and-down motion.
    • Parts of a Longitudinal Wave Compressions Rarefactions
    • Rarefactions ( are regions of low air pressure Compressions ( are regions of high air pressure Compressions Rarefactions
    • Sound Waves • Like other waves, a sound wave can be described by its wavelength and frequency. • Wavelength is the distance from one compression to another or one rarefaction to another. • The frequency of a sound wave is the number of compressions or rarefactions that pass at a given point in one second.
    • ound waves also reflec act, diffract, and interf
    • Propagation of sound Medium ( - Material that sound waves can travel through. - It can travel through solids, liquids and gases
    • The Speed of Sound • The speed of sound is usually fastest in solids, where molecules are closest together, and slowest in gases, where molecules are farthest apart.
    • Speed of Sound Depends on: 1. Type of medium ( ) - travels better through liquids and solids and gas can’t travel through a vacuum. 2. Temperature of medium (
    • Video about relation between amplitude and frequency
    • Intensity and loudness ( ) 1) Intensity depends on the energy in a sound wave. 2) Loudness is human perception of intensity. Properties of sound
    • Amplitude and Energy • Sound waves with greater amplitude carry more energy and sound louder. • Sound waves with smaller amplitude carry less energy and sound quieter. • The higher the amplitude of the wave is, the more compressed the particles in the compression are and the more spread out they are in the rarefactions.
    • Relation between amplitude and loudness
    • - High frequency means more vibrations hitting the ear. - Pitch is how high or how low a sound seems to be. - Healthy humans can hear from Frequency and pitch
    • Relation between frequency and pitch
    • - Ultrasonic sound has a frequency greater than 20,000 Hz. a) Dogs (up to 35,000 Hz) b) Bats (over 100,000 Hz) - Infrasonic sound has a Frequency and pitch (Con.)
    • Range of frequency