Answer :
When two musical notes are played together, they will produce beat frequencies.
Beat frequency is the difference between two frequencies.
Let us discuss beat frequencies that will be present if A and C, D and F, and all four musical notes are played together.
Frequencies of A and C are 220 and 264 Hz, respectively.
The beat frequency can be calculated as follows:
Beat frequency = Difference between two frequencies = 264 - 220 = 44 Hz
Frequencies of D and F are 297 and 352 Hz, respectively.
Beat frequency = 352 - 297 = 55 Hz
Therefore, the beat frequency present when D and F are played together is 55 Hz.
The musical notes A, C, D, and F produce three different beat frequencies when played together.
Thus, the beat frequencies will be present in the mixture of all four are as follows:
First, the beat frequency produced by A and C is 44 Hz.
Second, the beat frequency produced by D and F is 55 Hz.
Finally, the beat frequency produced by A and C and D and F is the difference between
(264 - 220) and (352 - 297) = 44 + 55 = 99 Hz.
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