Properties of Sound EQ How does intensity loudness

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Properties of Sound EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Properties of Sound EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Vocabulary • Intensity – the amount of energy an sound wave carries per second

Vocabulary • Intensity – the amount of energy an sound wave carries per second through a unit area. Measured in watts per meter squared. W/m² – Example – When a sound wave carries a large amount of energy, the molecules of the medium move a greater distance as the wave pass by, and the sound has a greater amplitude EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Vocabulary • Loudness – sound level, describes what you actually hear. A sound wave

Vocabulary • Loudness – sound level, describes what you actually hear. A sound wave of greater intensity sounds louder • Decibels (d. B) – measures loudness. A sound you can barely hear is 0 d. B. 100 d. B can damage your ears. EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Intensity determines loudness. A sound wave with a higher amplitude and energy is perceived

Intensity determines loudness. A sound wave with a higher amplitude and energy is perceived as a louder sound. EQ: How does intensity, loudness, frequency and pitch affect sound waves? SECTION OUTLINE

Intensity determines loudness. A sound wave with a lower amplitude and energy is perceived

Intensity determines loudness. A sound wave with a lower amplitude and energy is perceived as a softer sound. EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Vocabulary Frequency – the number of vibrations that occur per second in a sound

Vocabulary Frequency – the number of vibrations that occur per second in a sound wave. Measured in Hertz. A frequency of 50 Hz means 50 vibrations per second. – We hear sounds with frequencies that are between 20 Hz and 20, 000 Hz Ultrasound – sound waves with frequencies above the normal range of hearing Infrasound – sound waves with frequencies below the human range of hearing EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Vocabulary • Pitch – a description of how high or how low a sound

Vocabulary • Pitch – a description of how high or how low a sound seems to a person. • Pitch depends on the frequency of a sound wave – High frequency means high pitch – Low frequency means low pitch EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Frequency determines pitch. A sound wave with a lower frequency and longer wavelength is

Frequency determines pitch. A sound wave with a lower frequency and longer wavelength is perceived to have a lower pitch. A sound wave with a higher frequency and shorter wavelength is perceived to have a higher pitch. EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Piano Example of Pitch Tension - A tighter string produces a higher frequency. Therefore

Piano Example of Pitch Tension - A tighter string produces a higher frequency. Therefore you hear the sound at a higher pitch. Length of the string - right side of the piano has higher pitch, shorter string. Left side of piano has lower pitch, longer string Thickness of a string – thicker means lower EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Vocabulary • Resonance – when the frequency of the sound wave exactly matches the

Vocabulary • Resonance – when the frequency of the sound wave exactly matches the frequency of an object EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Doppler Effect The apparent change in frequency as a wave source moves in relation

Doppler Effect The apparent change in frequency as a wave source moves in relation to the listener EQ: How does intensity, loudness, frequency and pitch affect sound waves?

EQ: How does intensity, loudness, frequency and pitch affect sound waves? Doppler Effect •

EQ: How does intensity, loudness, frequency and pitch affect sound waves? Doppler Effect • As a sound source moves toward the listener, the waves reach the listener with a higher frequency. The pitch appears to increase because of the Doppler effect

Class Work and Homework Fill In • What did I learn • Confused •

Class Work and Homework Fill In • What did I learn • Confused • Say EQ: How does intensity, loudness, frequency and pitch affect sound waves? • Read pages O 46 – O 51. • Questions 1 -6, p. O 51 • 2 -2 Worksheet