Higher Intensity (Volume)

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Presentation transcript:

Higher Intensity (Volume) II. Characteristics of Sound (continued) D. Sound has different levels of “Intensity” 1. Intensity = Volume 2. Intensity is determined by the Amplitude More Compressed Wave Greater Amplitude Greater Energy Higher Intensity (Volume)

Greater Compression (Amplitude) Greater Intensity Louder Volume Less Compression (Amplitude) Lower Intensity Softer Volume

3. Intensity is measured in units called decibels (dB) a. More decibels = louder volume b. Each increase of 10 decibels has 10-times more intensity than the one before it. ● ex: 10 dB increase = 10X more intensity 20 dB increase = 100X more intensity

NO SOUND (HUMAN THRESHOLD) • Total silence

E. Pitch is how high or low a wave sounds. 1. Frequency determines pitch 2. Measured in Hertz (Hz) 3. Oscilloscopes analyze sound waves Convert compressional sound waves into transverse waves. b. Measure frequency and amplitude

Low Amplitude (quiet) High Amplitude (loud) Low Frequency (low pitch) High Frequency (high pitch)

4. Human voice pitch decreases with age a. Vocal chords get longer, thicker, and less flexible so they vibrate slower 5. Different animals hear different ranges of pitch a. Ex. Human hearing is different than dogs

Frequency (Hz) of Animal Hearing HUMAN DOG DOLPHIN BAT CAT FROG FISH 20 100 10,000 50,000 200,000 10 50 1000 20,000 100,000 infrasonic Frequency (Hz) of Animal Hearing audible (to humans) ultrasonic