How to Calculate Intensity from Wavelength & Amplitude

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To calculate intensity from wavelength and amplitude, the intensity in decibels (dB) can be determined using the formula I = 20 log_{20} (P/P_{0}), where P is the pressure in Pascals and P_{0} is a reference pressure of 2x10^{-5} N/m². The amplitude is measured in Pascals, which represents the pressure variation of the wave. Intensity is defined as the sound energy passing through a specific area per second. Understanding these relationships clarifies how to derive intensity from the given parameters.
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Can someone tell me how to find the intensity given only the wavelength in meters and amplitude in Pascals? Thanks.
 
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Does anyone know?

I found the frequency, but I'm a bit confused about why amplitude is in Pascals and how I would find the intensity.
 
The intensity in dB is
<br /> I = 20 log_{20} \left[ \frac{P}{P_{0} \right]<br />
Where P is the pressure of the wave in pascals and P_{0} = 2x 10^{-5} \frac{N}{m^2}.

Actually I've got a conflicting source that says "Intensity is a measure of the sound energy that passes through a given area each second."
 
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