# Beat Frequency Questions

I need help with a couple of problems:

A tuning fork of uknown frequency is sounded together with another tuning fork of 630 Hz. Seven beats are noted when a weight is put on the uknown tuning fork. The beat frequency is noted to increase. What is the original frequency?

A cottager lying on a beach notes that in a span of 12 minutes, 57 waves crash onto the beach. She also notes that as one crest is crashing on the beach another crest is passing a boat 10m away. If there are five more crests between the two noted crests, calculate the period, wavelength, and speed of the wave.

Thanks.

## Answers and Replies

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Andrew Mason
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Alain12345 said:
I need help with a couple of problems:

A tuning fork of uknown frequency is sounded together with another tuning fork of 630 Hz. Seven beats are noted when a weight is put on the uknown tuning fork. The beat frequency is noted to increase. What is the original frequency?
So what are the two possible frequencies of the unknown tuning fork? If you put a weight on the end of the tuning fork does the frequency go up or down? That will tell you which of the two possible frequencies is the correct one.

A cottager lying on a beach notes that in a span of 12 minutes, 57 waves crash onto the beach. She also notes that as one crest is crashing on the beach another crest is passing a boat 10m away. If there are five more crests between the two noted crests, calculate the period, wavelength, and speed of the wave.
What is the period or 1/f of the wave? How many wavelengths are there in the 10 m. distance? What is the wavelength. What is the relationship between $v, f and \lambda$?

AM

A tuning fork of uknown frequency is sounded together with another tuning fork of 630 Hz. Seven beats are noted when a weight is put on the uknown tuning fork. The beat frequency is noted to increase. What is the original frequency?
I think first you need to sort out your punctuations.The question should have read:
A tuning fork of unknown frequency is sounded together with another tuning fork of 630 Hz. Seven beats are noted .When a weight is put on the uknown tuning fork, the beat frequency is noted to increase. What is the original frequency?

Try to use Andrew's hints.

arunbg said:
I think first you need to sort out your punctuations.The question should have read:
A tuning fork of unknown frequency is sounded together with another tuning fork of 630 Hz. Seven beats are noted .When a weight is put on the uknown tuning fork, the beat frequency is noted to increase. What is the original frequency?

Try to use Andrew's hints.
lol I just typed out the same problem that the teacher gave me.