# Intensity - PowerPoint PPT Presentation

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Intensity. Scales Exponents Logarithms dB dB SPL. Scales. Linear Ratio. Exponents. Shorthand method of displaying very large or small numbers Numbers greater than 1 involve positive exponents Numbers less than 1 involve negative exponents. Logarithms.

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Intensity

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• Scales

• Exponents

• Logarithms

• dB

• dB SPL

• Linear

• Ratio

### Exponents

• Shorthand method of displaying very large or small numbers

• Numbers greater than 1 involve positive exponents

• Numbers less than 1 involve negative exponents

### Logarithms

• Base 10 logarithms used in the decibel

• Examples

• 1000 = 10 4 = 4

• 1 = 10 0 = 0

• .001 = 10 -3 = -3

### Decibel

• Standard measure of intensity

• dB = 20 (log Po / Pr)

• Where Po = pressure output

• Where Pr = pressure reference

### dB SPL

• Decibel Sound Pressure Level (dB SPL)

• Standard reference level.

• dB SPL = 20 (log Po / 20µPa)

• Where Pa = Pascal (measure of force)

• dB SPL = 20 (log Po / .0002 dynes/cm2)

• Where dynes are a measure of force