Go Back   Physics Help Forum > High School and Pre-University Physics Help > Waves and Sound

Waves and Sound Waves and Sound Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Sep 3rd 2017, 07:46 AM   #1
Junior Member
 
Join Date: Sep 2017
Posts: 4
Guitarist and trumpeter try to play together in a room filled with helium?

Hello,
How can I answer this question?

How does the musical experience of a guitarist and trumpeter try to play together in a room filled with helium?
stevenking10 is offline   Reply With Quote
Old Sep 3rd 2017, 11:03 AM   #2
Pmb
Physics Team
 
Join Date: Apr 2009
Location: Boston's North Shore
Posts: 1,180
Originally Posted by stevenking10 View Post
Hello,
How can I answer this question?

How does the musical experience of a guitarist and trumpeter try to play together in a room filled with helium?
Buy using extreme caution because there would be a lack of oxygen in the room which would first cause you to pass out then die. Instead get an oxygen tank with those hoses which fit into your nostrils. You should be perfectly safe if you do this. Check with your doctor before doing such a dangerous stunt.
Pmb is offline   Reply With Quote
Old Sep 3rd 2017, 08:59 PM   #3
Senior Member
 
Join Date: Apr 2017
Posts: 111
I think this question is really about the change in pitch ...

We're all know that breathing in a lung full of helium makes the voice higher ....

The frequency of vibration of the vocal cords has not changed , but the speed of sound has , resulting in the resonant frequency of the vocal tract being raised ...the resonant frequency is dependent on cavity size and speed of sound ....

So helium will change the tone of sound generators that rely on resonance ...

An acoustic guitar has a resonant chamber built in, so should give a higher pitch with helium ..... An electric guitar has none , so it's pitch will not change ...

A trumpet , like the vocal cavity relies on resonance , so pitch should change if helium is blown through it ...

I think that's right !?
oz93666 is offline   Reply With Quote
Old Sep 4th 2017, 04:07 AM   #4
Junior Member
 
Join Date: Sep 2017
Posts: 4
Originally Posted by oz93666 View Post
I think this question is really about the change in pitch ...

We're all know that breathing in a lung full of helium makes the voice higher ....

The frequency of vibration of the vocal cords has not changed , but the speed of sound has , resulting in the resonant frequency of the vocal tract being raised ...the resonant frequency is dependent on cavity size and speed of sound ....

So helium will change the tone of sound generators that rely on resonance ...

An acoustic guitar has a resonant chamber built in, so should give a higher pitch with helium ..... An electric guitar has none , so it's pitch will not change ...

A trumpet , like the vocal cavity relies on resonance , so pitch should change if helium is blown through it ...

I think that's right !?
That should be a correct explanation.
stevenking10 is offline   Reply With Quote
Old Sep 4th 2017, 04:14 AM   #5
Senior Member
 
Woody's Avatar
 
Join Date: Jun 2016
Location: England
Posts: 314
The pitch of the trumpet is a balance between the driving frequency (of the trumpeters lips) and the resonant frequency of the length of tubing between the mouthpiece and the bell of the trumpet.

The resonant frequency of the tubing will change with changes in the speed of sound of the gas in the tubing, so the pitch will change.

The guitar pitch is dictated by the length and tension of the strings, and will be unaffected by changes in the speed of sound in the surrounding gas.
However (as you indicate) the resonance within the body of the guitar will change, so the quality of the sound will be affected, but not the pitch.
__________________
~\o/~
Woody is offline   Reply With Quote
Old Sep 4th 2017, 05:01 AM   #6
Senior Member
 
Join Date: Apr 2017
Posts: 111
Originally Posted by Woody View Post
... the resonance within the body of the guitar will change, so the quality of the sound will be affected, but not the pitch.
Well surely the acoustic guitar is just the same as the voice box , the vocal cords produce the same frequency , but with helium , higher frequencies now resonate more and are predominant ... the pitch(frequency) in both guitar and voice box is higher with helium ..

It would be interesting to make a small hole in an acoustic guitar ,connect a tube , by feeding in different gases , or even cold or hot air , a change in pitch could be effected .
oz93666 is offline   Reply With Quote
Old Sep 4th 2017, 06:25 AM   #7
Senior Member
 
Woody's Avatar
 
Join Date: Jun 2016
Location: England
Posts: 314
There is a common misconception about the way the sound of the voice changes in Helium.
The basic driving frequency is produced by the vocal chords, and this (like the guitar string) doesn't change (much).

However the final sound that comes out of our mouths depends on a complex series of resonances in the vocal tract, nasal cavities, sinuses etc.

There may be a small change in the vibration of the vocal chords (due to resonant feedback)
but the main cause of the difference in timbre is the change in the resonant overtones rather than a change in the basic pitch of the voice.
__________________
~\o/~
Woody is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Waves and Sound

Tags
filled, guitarist, helium, play, room, trumpeter



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Chat Room, Help, or Contact? THERMO Spoken Here General Physics 1 Nov 7th 2016 02:32 PM
Dielectric Filled Parallel Plate Capacitor Question prodgod Electricity and Magnetism 0 Feb 25th 2011 10:44 AM
inverted wine bottle filled with water frend Thermodynamics and Fluid Mechanics 2 Jun 24th 2009 10:37 AM
Object in fluid filled container sirdarksol Thermodynamics and Fluid Mechanics 1 Apr 27th 2009 11:10 PM
room ventilation climber123boy Thermodynamics and Fluid Mechanics 1 Apr 11th 2009 10:12 AM


Facebook Twitter Google+ RSS Feed