# Physics-Beats and Frequencies

• Apr 29th 2013, 05:13 PM
sakonpure6
Physics-Beats and Frequencies
Hi there! I am having trouble with the following question:

Quote:

Plasticine (which lowers the pitch) is added to one tine of the tuning forks of unknown frequency referred to in question #4 (initial frequency = 300 Hz possible frequencies 303 Hz or 297 Hz). The number of beats decreases to one(per second). What was the frequency of the unknown fork?

Well, i know how to calculate the beat difference, but I do not under stand which of the 303Hz or the 297Hz referred to question #4 are the correct initial frequencies before adding the Plasticine!!! Can some one explain that to me please!

• Apr 29th 2013, 09:38 PM
sa-ri-ga-ma
Re: Physics-Beats and Frequencies
When you add plasticine, the unknow frequency of the tuning fork reduces to either 301 or 295. With the known ruling fork, which condition satisfies the given data?
• Apr 30th 2013, 03:48 PM
sakonpure6
Re: Physics-Beats and Frequencies
This is the only thing I don't understand >.< how do you determine that?!!!?!?!?!?!?!

Btw here is question #4

Two tuning forks are sounded together, producing three beats per second. if the first fork has a frequency of 300 Hz , what are the possible frequencies for the other fork?

The answers are: 297Hz and 303Hz
• Apr 30th 2013, 07:24 PM
sa-ri-ga-ma
Re: Physics-Beats and Frequencies
When you load a tuning fork, if the number of beats decreases, then the frequency of the unknown tuning fork is larger than the known frequency.
• Apr 30th 2013, 07:58 PM
sakonpure6
Re: Physics-Beats and Frequencies
Quote:

Originally Posted by sa-ri-ga-ma
When you load a tuning fork, if the number of beats decreases, then the frequency of the unknown tuning fork is larger than the known frequency.

why can't it be bigger? you would get the same amount of beats? right?