Sound power
Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time. The SI unit of sound power is the watt (W). It is the power of the sound force on a surface of the medium of propagation of the sound wave. For a sound source, unlike sound pressure, sound power is neither room-dependent nor distance-dependent. Sound pressure is a measurement at a point in space near the source, while the sound power of a source is the total power emitted by that source in all directions. Sound power passing through an area is sometimes called sound flux or acoustic flux through that area.
Mathematical definition
Sound power, denoted P, is defined by
where
In a medium, the sound power is given by
where
Podcasts:
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by Paddy Casey
Sound Barrier
by: Paddy CaseyAre you listening, can you hear them?
In the silence low, can you hear them?
It's just a sound that was created, in a place that's been sedated
In a life that's been frustrated, in a need that's left unsated
It's a scream that has been stifled, someone's life that has been rifled
Not of the few but of the multitude, born hard and raised in the necessitude
Are you listening, can you hear them?
In the silence low, can you hear them?
It's the silent sound of anger, it's the silent sound of rage
It's the spirits cry for freedom, from their story in a cage
Where so much is left unspoken and by that very same token
Hearts and backs are broken 'cos so much is left unspoken
Are you listening, can you hear them?
In the silence low, can you hear them?
What would make him do it, has he no way to see through it?
Through the sound that's been created, in a life that's been frustrated
Are you listening, can you hear them?
In the silence low, can you hear them?
Are you listening, can you hear them?
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