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Beat Frequency
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- čas přidán 30. 05. 2013
- Here two tuning forks are used to demonstrate beat frequencies using sound.
For more on the theory behind this demonstration, and to see others like it, please visit us at: demos.smu.ca
Omg, this is exactly what I came here for. Quick and to the point. Thanks so much. Great video
Glad it helped!
@@SMUPhysics it really did ❤
Woah thank u so much i was studying the concept of beat frequency but listening to this practically is so cool.i think im never gonna forget it.Loved it😃
aops physics class?
Glad you liked it!
@@Chris-yc5rx na na .......biology class😅😅
Thank you teacher. I was not able to visualise it till now but this helped a lot. ❤
waxing wanning are things which i just read in books. Its ben aeons since ive visited lab, thanks for this wonderful video which made my understanding still better
Are you sure those two tuning forks are 12 cycles different? The beat frequency seems to be less than that.
If they are 12 cycles apart, then the beat frequency will be 6 Hz, which seems reasonable from the sound.
Ryan Finch No, the number of beats equals the simple difference, not half. It seems more like a 2 Hz beat, so my guess is that the one on the left is 240 Hz, not 250 Hz.
@@ryanfinch9281 more like 4 bps, and should be 12.
The difference b/w frequencies should be less then 10 Hz i think
If the difference between two frequencies is 12 Hz, we should be hearing 12 beats per second. Are you sure those tuners are representing accurate frequencies?
That's an excellent point and we didn't catch it! The frequencies listed I'm sure are just what was written on the tuning fork. Thanks for pointing this out. (we did better here: czcams.com/video/I9f6bP3x_yo/video.html)
How u measure that 12 hz frequency pls tell how to measure when vibrating
@@manikandanelumalai277It is the difference of the frequencies of the two sources
first frequency minus second frequency will give you beat frequency@@manikandanelumalai277
Great and to the point! One issue: why isn't it 440 or something
Just a choice. These were the forks we had that made the effect clear. I think I have some middle-A tuning forks somewhere and it would work the same with them.
It can be anything , but i think the frequency difference should be less then 10 Hz
I think the beat frequency here is less than 12 which isn't expected.....
Yeah, it sounds like it is only 3,4,5 Hz.
thnx got what i needed
Wow thank you.
I am here from Ashish Gupta sir old lectures.😂
Me too Bhai😂😂 lecture me awaz low thi... @agphysics u r best sir
That's amazing
Thanks!
This is what I wanted to watch...... apprrciate it ❤️
Thanks!
What's the lowest tuning fork that is buyable? It's an interesting concept to understand vibration.
doubt : do low frequency tuning forks produce more vibrations ?
+ANU .PRIYA Less. Frequency means vibrations per second. So low frequency forks vibrate less than high frequency forks.
Does each vibration happen for a longer duration ?
I have the doubt because tuning forks are used in clinical examination. Low frequency tuning forks are preferred to check vibration sense. Books say that reason for choosing it is because " Tuning forks of higher frequency like 512 Hz or 256 Hz produce more sound than vibration, where as tuning forks with lower frequency produce more vibration than sound"
Ideally 128 Hz preferred for checking vibration sense
@@drpriya07 That has nothing to do with physics, it's about the human sense. Skin can probably sense lower frequency vibrations, because most things in nature that you need to feel don't vibrate that fast. While our ears hear higher frequencies better, because sounds that we need to hear are not that low. But the thing that happens in the forks is always a vibration.
@@Mobin92 uhhh bro.. you're 7 yrs late..💀
Why did the tuning fork on the left move?
WOW NO explanations needed OMG
Simple and clear❤
That's amazing ❤
Thanks A Lot 👍🙏
loved it
Asad Niazi Sir sent me this...
It was Sooooooooooo peaceful
thank you
Thankyou
+Randev Widuranga You're welcome!
Brilliant
Thanks a lot that was nice
Glad you liked it!
How to measure in that value
You could digitize the sound waves with a microphone and your computer's soundcard. There are also smartphone apps like PhyPhox that could do it.
So while pure tone is continuous sound, beat is waxing and waning sound produced due to interference of pure tones.
Beat frequencies are due to two or more sources of "pure tone" interfering.
@@SMUPhysics Fixed. Is it correct now?
Ek number
But my sir in college told me that if frequency difference is more then 10, we cannot recognize beats
It does get harder to hear, the higher the beat frequency is. but it's more a matter of what percentage of the source frequency is.
I can hear the third sound!!!!!!
Wow 😲 exactly
Great
The frequency difference is more than 10....how are beats still observed ????
You can still have beats if del(f)>10
Actually 1533Hz and 1537Hz, according to an analyzer I just used.
See this makes more sense to me, though I've only just been introduced to this topic. If it was a beat frequency of 12, wouldn't I be able to count twelve beats in a second? This seems closer to 6 beats per second which is closer to what your analyzer says.
I was going to say, the beat frequency sounds pretty clearly like it's 4Hz which implies the two forks should be 4Hz apart from each other. Your numbers make much more sense.
Ever screamed right in someone's ear and they scream in yours and it sounds like a "record scratch" like when someone ubruptly stops a record??? The needle hitting the record....
cool
Thanks
You are welcome!
Cool
That is called resonance frequency
The resonant frequency is the frequency the fork vibrates when struck. The beat frequency is what you get from two sources that have a resonant frequency that differs by only a few Hertz.
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Anyone here after Ashish Gupta sir lectures ? 😂
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M bhi😂
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