Question 962834
whisper:
{{{ 30 = 10*log( I*10^12 ) }}}
{{{ log( I*10^12 ) = 3 }}}
{{{ 10^3 = 10^12*I }}}
{{{ I = 10^3*10^((-12)) }}}
{{{ I = 10^-9 }}}
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train whistle:
{{{ 90 = 10*log( I*10^12 ) }}}
{{{ log( I*10^12 ) = 9 }}}
{{{ 10^9 = 10^12*I }}}
{{{ I = 10^9*10^((-12)) }}}
{{{ I = 10^-3 }}}
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{{{ 10^-3 = k*10^-9 }}}
{{{ k = 10^-3 / 10^-9 }}}
{{{ k = 10^-3*10^9 }}}
{{{ k = 10^6 }}}
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the train whistle is 10^6 or
one million times more
intense than the whisper