All Questions
300
questions
-1
votes
0
answers
19
views
Doppler effect for multiple sources [closed]
Given the figure below, how can I determine the speed from the two sources given that they both produce a frequency of 1000 Hz, and the speed of sound can be assumed to 340 m/s. The sources are both ...
- 1
0
votes
1
answer
33
views
Changing the frequency of the tuning forks
I just bought some tuning forks with frequencies of 128 Hz and 512 Hz. However, when I tested them using an app, their frequencies turned out to be lower than the specified values. How can I increase ...
- 1
0
votes
1
answer
64
views
Is there any deeper explanation behind this simple acoustic experiment?
my question is a bit inconvenient but let me explain:
I recently saw an experiment for primary school where two strings are attended to a coat hanger (see here: https://www.youtube.com/watch?v=...
- 308
2
votes
0
answers
36
views
Frequence vs speed of a moving object
Imagine swinging wood stick using hand (say it's a 1-meter long cylinder with 2 centimeter diameter, just for the sake of argument). When doing it fast (angular velocity = $\omega_1$), it will create ...
- 21
0
votes
1
answer
99
views
Measuring the tension of a drumhead
I'm working on an experiment to see how the tension of a drumhead impacts the frequency of its sound, but I'm not sure as to how I could measure this.
I found this forum thread from 2012, which ...
- 1
1
vote
1
answer
38
views
How to standardize the energy of a Dirac delta function relative to sample rate (width) and amplitude?
Background
I was instructed that a Dirac delta function (impulse from $0$ to $A$ then back to $0$ at short duration) has a white noise audio frequency type excitation distribution here
ie. It should ...
- 321
0
votes
1
answer
82
views
Do humans hear the beat frequency or the average frequency or just individual frequencies?
We have two sound sources of the same amplitude but of slightly different frequencies : $f_1$ and $f_2$. When they are sounded simultaneously what would be the frequency that an observer hears ?
I ...
- 107
1
vote
4
answers
209
views
$0$th overtone in closed organ pipes
I know about $1$st, $2$nd or other overtones in the formula of frequency in a one-sided open system (specifically in closed organ pipes) that is
$$ f = \frac{\left( 2 n + 1 \right) v}{4 L} \tag{1} \...
- 23
2
votes
0
answers
58
views
How do lower frequencies change differently than higher ones as they travel?
I read the following on the internet:
"This means that as sound travels, its relative frequency content alters making the low frequencies more prominent at greater distances, creating low ...
- 131
-1
votes
1
answer
154
views
The physics behind the circle / spiral of fifths
In music theory, there is this thing called the circle of fifths.
If you take a string, and you divide it in two equal parts, you get a so called octave. It is, to our ear, kind of "the same tone&...
19
votes
6
answers
3k
views
Can human ear hear 4 Hz frequency, if I tap my hand 4 times per second on table?
Frequency means the number of repetitions per second. Humans can hear between 20 Hz and 20 kHz, but I have a very basic question: if I tap my hand four times on a table per second, it means I am ...
- 301
1
vote
1
answer
96
views
Change in Frequency while Tearing Paper
Let us assume you have a 30cm strip of paper, and you tear it lengthwise. Let us abbreviate the frequency produced when you reach the end of the paper as $f_2$ and the frequency of sound heard when ...
0
votes
1
answer
96
views
Is sound essentially motion?
From my understanding, the only way for humans to create sound is by moving our bodies, vocal cords, or by moving other objects. So depending on how fast we or other objects can move, different ...
- 109
13
votes
3
answers
4k
views
Why do strings in musical instruments have helical shape?
We learn that waves travels in strings under tension, have fundamental frequencies, but I have no luck understanding why don't musical instruments have simple strings with uniform thickness which we ...
- 169
0
votes
2
answers
101
views
Does rhythm create pitch?
As in,
matter (a physical object)
that is vibrating
= a pitch
And secondly
If we calculate bpm with a “tick” which is just indefinite pitched percussion, how does an indefinite pitched beat compare to ...
- 109