HELP needed on quick question - physics

Watch
Batman2k1
Badges: 14
Rep:
?
#1
Report Thread starter 1 year ago
#1
https://pmt.physicsandmathstutor.com...Waves%20QP.pdf

Q2A why is the answer 110Hz
Do not get octaves bit.
I looked at the textbook , cant seem to find a mention of octaves, can someone help me on this
0
reply
Eimmanuel
Badges: 13
Rep:
?
#2
Report 1 year ago
#2
(Original post by Batman2k1)
https://pmt.physicsandmathstutor.com...Waves%20QP.pdf

Q2A why is the answer 110Hz
Do not get octaves bit.
I looked at the textbook , cant seem to find a mention of octaves, can someone help me on this
The following 2 links may help:
https://newt.phys.unsw.edu.au/jw/strings.html
https://newt.phys.unsw.edu.au/music/...itarintro.html
0
reply
Batman2k1
Badges: 14
Rep:
?
#3
Report Thread starter 1 year ago
#3
I looked at the links, and what i can gather is...
scale position touched
fraction of string length
harmonic number
interval above open string

is the following in order

double octave 1/4 4 double octave

so if the q says usually instrument has 440Hz, but this instrument is in 1st harmonic fq but 2 octaves down,

But if its in 1st harmonic, and double octave = 4 harmonic number = 440Hz simple maths and divide by 4 = 110Hz

If my understanding is correct, it depends where you pluck the string scale touched, that produces an octave.
Think octave is an interval of some kind - very wordy text.
Is there anything to add on here? - thanks for showing me a source.

besides this, i am confused by a thing that is with a progressive wave:
in progressive waves, all points have the same amplitude (in turn), - unsure
in stationary waves, they do not - i get this nodes and antinodes


0
reply
Batman2k1
Badges: 14
Rep:
?
#4
Report Thread starter 1 year ago
#4
another thing that bugged me was

https://pmt.physicsandmathstutor.com...Waves%20QP.pdf

Q3B and C is what i need help with - it is waves topic

MS here:
https://pmt.physicsandmathstutor.com...Waves%20MS.pdf

3b) half wavelength = 0.21m - got it.
but i dont understand 2(d2 - d1) = 2

3c) q just wants 2 know how 2 measure speed of sound from instrument device of some sorts

ms: Continue to move tube until tube is at greatest distance or repeat readings for decreasing
distance back to starting point.

confused here
0
reply
Eimmanuel
Badges: 13
Rep:
?
#5
Report 1 year ago
#5
(Original post by Batman2k1)
another thing that bugged me was

https://pmt.physicsandmathstutor.com...Waves%20QP.pdf

Q3B and C is what i need help with - it is waves topic

MS here:
https://pmt.physicsandmathstutor.com...Waves%20MS.pdf

3b) half wavelength = 0.21m - got it.
but i dont understand 2(d2 - d1) = 2

3c) q just wants 2 know how 2 measure speed of sound from instrument device of some sorts

ms: Continue to move tube until tube is at greatest distance or repeat readings for decreasing
distance back to starting point.

confused here
The links to the questions seem to be broken.
0
reply
Batman2k1
Badges: 14
Rep:
?
#6
Report Thread starter 1 year ago
#6
https://pmt.physicsandmathstutor.com/download/Physics/
/A-level/Topic-Qs/AQA/03-Waves/Set-M/Superposition%20&%20Stationary%20Waves%20QP.pdf

MS:

https://pmt.physicsandmathstutor.com/download/Physics/A-level/
Topic-Qs/AQA/03-Waves/Set-M/Superposition%20&%20Stationary%20Waves%20MS.pdf

hopefully link is fullyhere now
(Original post by Eimmanuel)
The links to the questions seem to be broken.
oh damn it can now. by the way i appreciate your support on my understandings of physics.
Last edited by Batman2k1; 1 year ago
0
reply
Eimmanuel
Badges: 13
Rep:
?
#7
Report 1 year ago
#7
(Original post by Batman2k1)
....
besides this, i am confused by a thing that is with a progressive wave:
in progressive waves, all points have the same amplitude (in turn), - unsure
in stationary waves, they do not - i get this nodes and antinodes
Go to the following links:
Transverse progressive wave
http://physics.bu.edu/~duffy/HTML5/wave.html

Transverse stationary wave
http://physics.bu.edu/~duffy/HTML5/t...ding_wave.html
You can press on the n = 1, n = 2, etc to look at the various amplitude at different positions.

In a progressive wave, energy is transported outward from the source and “it would affect all the particles evenly”, so all the particles would have the same amplitude.
0
reply
Eimmanuel
Badges: 13
Rep:
?
#8
Report 1 year ago
#8
(Original post by Batman2k1)
...
3b) half wavelength = 0.21m - got it.
but i dont understand 2(d2 - d1) = 2
...

The “2” is to account for when d2 increases by x m, the movable tube increases the length by 2x: upper horizontal section increases by x m and lower horizontal section increases by x m.
0
reply
Eimmanuel
Badges: 13
Rep:
?
#9
Report 1 year ago
#9
(Original post by Batman2k1)
...
3c) q just wants 2 know how 2 measure speed of sound from instrument device of some sorts

ms: Continue to move tube until tube is at greatest distance or repeat readings for decreasing
distance back to starting point.

confused here
There is a limit that the movable tube can extend.
I thought it is “obvious” that you need to repeat the experiment to ensure the “reproducibility” of your experimental result.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

If you haven't confirmed your firm and insurance choices yet, why is that?

I don't want to decide until I've received all my offers (39)
40.63%
I am waiting until the deadline in case anything in my life changes (21)
21.88%
I am waiting until the deadline in case something in the world changes (ie. pandemic-related) (5)
5.21%
I am waiting until I can see the unis in person (9)
9.38%
I still have more questions before I made my decision (5)
5.21%
No reason, just haven't entered it yet (6)
6.25%
Something else (let us know in the thread!) (11)
11.46%

Watched Threads

View All