# Beat frequency of turning folk

Discussion in 'Physics' started by mndewa, Feb 11, 2013.

1. ### mndewa Thread Starter New Member

Sep 16, 2012
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a turning folk when sounded with a folk of frequency 256Hz gave 4 beats/second. when small beat of wax was attached to a prong of the folk of unknown frequency 3 beats/seconds were produced.what is the frequency of unknown

Oct 2, 2009
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3. ### logearav Member

Aug 19, 2011
248
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Hi mndewa,
The frequency should be either 256+4 or 256-4 which means either 260 or 252. On loading with wax, the frequency will decrease. So the frequency of unknown fork is 252. Hope this helps.

4. ### Kermit2 AAC Fanatic!

Feb 5, 2010
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If the freq. of unknown decreases with a wax load, then the answer would be 260 Hz.

when loaded the freq of unknown became closer to the standard as in 3 beats vs 4 beats unloaded. Therefore the unknown would be higher.

logearav likes this.
5. ### logearav Member

Aug 19, 2011
248
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Yes Kermit2 is correct.