Question
Download Solution PDFThe sound pressure is measured in:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Sound Pressure:
- Definition: Sound pressure is the difference between the instantaneous pressure at a point in the presence of a sound wave and the ambient atmospheric pressure.
- Measurement Unit:
- The SI unit of sound pressure is the Pascal (Pa).
- Other common units include:
- Newton per square meter (N/m²)
- Bar
- Dyne per square centimeter (dyne/cm²)
- Sound Pressure Level (SPL):
- Definition: Sound pressure level (SPL) is a logarithmic (decibel) measure of the sound pressure relative to the reference value of 20 µPa, which is the threshold of hearing.
- Threshold of Hearing:
- This is the quietest sound that most young healthy people can hear.
- Measurement:
- Sound pressure level \(L_p\) measured in decibels (dB).
- It is calculated using the formula:
- \(L_p = 20 \log \left(\frac{p}{p_0}\right) \)
- Where, \(p =\) Root mean square sound pressure
- \(p_o\)= Reference sound pressure (usually 20 µPa or 0.00002 Pa)
Last updated on May 28, 2025
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