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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)

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Welcome Back Minions!

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  1. Welcome Back Minions!

  2. Question… • What do you notice about sound waves?

  3. Similarities • Did you know there are similarities between electromagnetic waves and sound waves? • Reflection • Diffraction

  4. Reflection • Sound hitting a surface and bouncing back (or reflecting) • A reflected sound wave is known as an echo!

  5. Diffraction • Sound waves can bend around corners!

  6. Properties… • Properties of sound waves… • Pitch • Loudness • Sound level

  7. Pitch • Pitch • Description of how high or low the sound seems to a person. • This depends on the frequency of the sound wave.

  8. 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.

  9. Pitch • Some other ranges…

  10. PITCH Higher Frequency=Higher pitch Lower frequency= Lower pitch

  11. Loudness • Loudness • Perception of the energy of sound • 2 Factors • Amount of energy to make the sound • Distance from the source of the sound

  12. Loudness • Energy • Greater the energy, the louder the sound!

  13. Loudness • Distance • Intensity • Closer to source = more intense • As you move from source = less intense

  14. LOUDNESS Greater Amplitude = Louder sound Smaller amplitude = softer sound

  15. Sound Level • Measuring loudness • Decibel • How different level of sounds are measured and compared

  16. Sound Level • Here is a list of ranges…

  17. SOUND LEVEL A measurement of sound pressures (measured in Decibels (dB))

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