document.write( "Question 1161878: Two frequencies of sound are played on an instrument governed by the function n(t)=8cos(20πt)cos(1000πt). What is the period and frequency of the fast and slow oscillation? What is the amplitude? \n" ); document.write( "

Algebra.Com's Answer #785516 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "cos(a)*cos(b) =  + .\r\n" );
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document.write( "There are two harmonic modes in this instrument.\r\n" );
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document.write( "The low frequency is  Hertz = 490 Hertz;  the period is   of a second.\r\n" );
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document.write( "The high frequency is  Hertz = 510 Hertz;  the period is   of a second.\r\n" );
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document.write( "The amplitude is 4 units for each harmonic mode.\r\n" );
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