Unformatted text preview: 44. (a) The number of diﬀerent ways of picking up a pair of tuning forks out of a set of ﬁve is 5!/(2!3!) = 10.
For each of the pairs selected, there will be one beat frequency. If these frequencies are all diﬀerent
from each other, we get the maximum possible number of 10.
(b) First, we note that the minimum number occurs when the frequencies of these forks, labeled 1
through 5, increase in equal increments: fn = f1 + n∆f , where n = 2, 3, 4, 5. Now, there are only
4 diﬀerent beat frequencies: fbeat = n∆f , where n = 1, 2, 3, 4. ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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