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Unformatted text preview: with no amplitude modulation. If the two pitches were out of tune, you will hear beats. The piano string could then be tightened or loosened (to retune it) until the beat frequency between tuning fork and piano string goes to zero. (+1 pt for recognizing the need of tuning fork or something else that generates the puretone at the correct frequency, and for recogninzing that if they are in tune, there are no beats, if they are out of tune, you hear beats) (+1 pt for describing how to x the problem if theyre out of tune) Some possibly useful equations: y = y 1 + y 2 = A [sin( kxt ) + sin( kxt + )] = (2 A cos 2 ) sin( kxt + 2 ) sin a + sin b = 2 cos( ab 2 ) sin( a + b 2 ) r = 2 n = 2 L n ( n = 1 , 2 , 3 , ... ) f n = v n v = q T = m L 1...
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 Spring '08
 Wu
 Mass, Work

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