Welcome Back Minions!
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Transcript of Welcome Back Minions!
Welcome Back Minions!
Question…
• What do you notice about sound waves?
Similarities
• Did you know there are similarities between electromagnetic waves and sound waves?– Reflection– Diffraction
Reflection
• Sound hitting a surface and bouncing back (or reflecting)
• A reflected sound wave is known as an echo!
Diffraction
• Sound waves can bend around corners!
Properties…
• Properties of sound waves…– Pitch– Loudness• Sound level
Pitch
• Pitch– Description of how high or low the sound seems to a person.– This depends on the frequency of the sound wave.
Pitch
• Normal range of hearing– 20 Hz to 20,000 Hz• Sounds below this range is called Infrasound.• Sounds above this range is called Ultrasound.
Pitch
• Some other ranges…
PITCHHigher Frequency=Higher pitch
Lower frequency= Lower pitch
Loudness
• Loudness– Perception of the
energy of sound– 2 Factors• Amount of energy to
make the sound• Distance from the
source of the sound
Loudness
• Energy– Greater the energy,
the louder the sound!
Loudness• Distance
– Intensity• Closer to source = more intense• As you move from source = less intense
LOUDNESS
Greater Amplitude = Louder soundSmaller amplitude = softer sound
Sound Level
• Measuring loudness– Decibel• How different level of
sounds are measured and compared
Sound Level
• Here is a list of ranges…
SOUND LEVELA measurement of sound pressures (measured in
Decibels (dB))