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#1
So basically, I'm going to ask you guys some physics question about sound.
1)What happens to the sound if we make the amplitude smaller?
2)A)What is sound exactly?
B)How could we actually proof this?
3)I have got this amp, the highest volume is 50db, what is the dB when the sound is 4x harder?
4)How would we calculate the distance between the source and your ear, you already know this that sound moves 340meters per seconds in air and the time is 3 seconds before the sound gets in your ear from the source?
5)How does sound move through glass?
6)What happens when we put an alarm in a matter free room?
Try to answer them.
I know answers to all.
#4
Do your own homework, getting other people to do it won't help you pass any exams.
Call me Matthew.
#6
I think your avatar is relative here, TS.
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#7
Quote by liampje
So basically, I'm going to ask you guys some physics question about sound.
1)What happens to the sound if we make the amplitude smaller?
2)A)What is sound exactly?
B)How could we actually proof this?
3)I have got this amp, the highest volume is 50db, what is the dB when the sound is 4x harder?
4)How would we calculate the distance between the source and your ear, you already know this that sound moves 340meters per seconds in air and the time is 3 seconds before the sound gets in your ear from the source?
5)How does sound move through glass?
6)What happens when we put an alarm in a matter free room?
Try to answer them.
I know answers to all.


1. gets quieter
2 a. a type of wave
b. through interference
3. i'd assume 200dB, but I've not done anything about that before
4. s=d/t, so d= s x t, 340 x 3 = 1020m
5. makes the atoms in the glass vibrate (i think)
6. as in a vacuum? you wouldn't be able to hear it
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#8
Quote by Masshuu
Do your own homework, getting other people to do it won't help you pass any exams.

This is homework from like 4 months ago.
Now we are busy on light.
#9
Quote by liampje
I know answers to all.

Prove it.

(Alternate answer) I come to UG to get my mind off school, gtfo jerkface.
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that joke regarding your username was NOT originally posted by blake1221. That was a Gunpowder original.

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#10
Quote by liampje
This is homework from like 4 months ago.
Now we are busy on light.


What's the point of asking then?
Call me Matthew.
#11
sound is particles crashing into each other. that's why in space, no one can hear you fap.

decibels are logarithmic. you need 10x as much sound energy to sound twice as loud.

light moves faster than sound. you'd need a long cable.

sound moves through glass the same way as it does through air, but slower.

this shit's 19th century physics. you don't need to prove it again.
#12
Quote by Unholy.Daemon
1. gets quieter
2 a. a type of wave
b. through interference
3. i'd assume 200dB, but I've not done anything about that before
4. s=d/t, so d= s x t, 340 x 3 = 1020m
5. makes the atoms in the glass vibrate (i think)
6. as in a vacuum? you wouldn't be able to hear it

Everything is good except 3.
The rule of dB is that it gets 2x louder with three added, and 4 times with 6, and 8 times with 12 etc.
#13
Quote by liampje
Everything is good except 3.
The rule of dB is that it gets 2x louder with three added, and 4 times with 6, and 8 times with 12 etc.


well like i said, i've never done anything on dB before, so i figured i'd got that wrong
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#14
Quote by Masshuu
What's the point of asking then?

Making guitarists aware of that they are constantly busy with physics.
#15
Quote by Masshuu
What's the point of asking then?

Presumably to laugh at stupid people who think they know the answers but are incorrect.
#16
So basically, I'm going to ask you guys some physics question about sound.
1)What happens to the sound if we make the amplitude smaller?
gets quieter
2)A)What is sound exactly? pressure waves
B)How could we actually proof this? sand on a table or racking up the bass and feeling the grooves
3)I have got this amp, the highest volume is 50db, what is the dB when the sound is 4x harder? dB is a log scale => twice as many dB = 10 louder - you do the maths
4)How would we calculate the distance between the source and your ear, you already know this that sound moves 340meters per seconds in air and the time is 3 seconds before the sound gets in your ear from the source? seriously - this is so basic it hurts
5)How does sound move through glass? just like air
6)What happens when we put an alarm in a matter free room? the vacuum pressure pulls it apart and the room is no longer matter free
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#17
Quote by liampje
So basically, I'm going to ask you guys some physics question about sound.
1)What happens to the sound if we make the amplitude smaller?
2)A)What is sound exactly?
B)How could we actually proof this?
3)I have got this amp, the highest volume is 50db, what is the dB when the sound is 4x harder?
4)How would we calculate the distance between the source and your ear, you already know this that sound moves 340meters per seconds in air and the time is 3 seconds before the sound gets in your ear from the source?
5)How does sound move through glass?
6)What happens when we put an alarm in a matter free room?
Try to answer them.
I know answers to all.

1. If amplitude is reduced,sound becomes softer(reduced intensity at the same distance from the source)
2. Sound is a form of energy transmitted by oscillating particles of the medium(it is a mechanical wave.
3. 50db+log4
4. Speed x time=distance

5. Sound travels through glass due to energy transfer through molecules vibrating about their mean position.
6. The alarm clock is matter itself sound will not be able to travel because lack of elastic medium.
Last edited by hames jetfield at Apr 28, 2011,
#18
Quote by doive
So basically, I'm going to ask you guys some physics question about sound.
1)What happens to the sound if we make the amplitude smaller?
gets quieter
2)A)What is sound exactly? pressure waves
B)How could we actually proof this? sand on a table or racking up the bass and feeling the grooves
3)I have got this amp, the highest volume is 50db, what is the dB when the sound is 4x harder? dB is a log scale => twice as many dB = 10 louder - you do the maths
4)How would we calculate the distance between the source and your ear, you already know this that sound moves 340meters per seconds in air and the time is 3 seconds before the sound gets in your ear from the source? seriously - this is so basic it hurts
5)How does sound move through glass? just like air
6)What happens when we put an alarm in a matter free room? the vacuum pressure pulls it apart and the room is no longer matter free

1) good
2) a and b good.
3)fault, 50 dB + 3 is twice as loud + 6 is four times louder.+9 is eight times louder +12 is 16 time louder so double the amount of dB wouldn't be 10 times louder.
4)If it's so basic why dont you calculate it.
5)Good
6)Not really, in class we got this demo where the teacher put an alarm in a non vacuum thingy then sucked the air out of it and you couldnt hear it.
#19
Quote by hames jetfield
1. If amplitude is reduced,sound becomes softer(reduced intensity at the same distance from the source)
2. Sound is a form of energy transmitted by oscillating particles of the medium(it is a mechanical wave.
3. 50db+log4
4. Speed x time=distance

5. Sound travels through glass due to energy transfer through molecules vibrating about their mean position.
6. The alarm clock is matter itself sound will not be able to travel because lack of elastic medium.

Do you actually know the logarythm of dB?
#20
Quote by liampje
Making guitarists aware of that they are constantly busy with physics.


or it's to prove you know how to use an answer sheet.
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#21
the vacuum pressure pulls it apart and the room is no longer matter free
vaccum cant apply pressure. It is the pressure outside the room that will crush it. What if the room is in space? And what if the walls of the room are strong enough to bear the maximum force applied by the atmosphere(pressure x area of wall)?
#22
Quote by Steve635z
After you fail at this subject, can you do chemistry?

Hmm...
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#23
When it comes to complex sounds you got an infinite ammount of dBs.
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#24
From now on, every single time I learn something new in class, I'm going to make a thread quizzing everybody on it. Just 'cause.

This thread is lame and pointless.
R.I.P. M.C.A.
Tweet at me bro
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Quote by blake1221
Don't be ludicrous, lushacrous.
Quote by Gunpowder
that joke regarding your username was NOT originally posted by blake1221. That was a Gunpowder original.

I INVOKE SOPA TO SMITE YE FOR THIS FALSEHOOD.
#25
Quote by laid-to-waste
or it's to prove you know how to use an answer sheet.

You know, that's what other kids do, not me.
If I WOULD do it, I would ask French shit.
#26
Quote by liampje
You know, that's what other kids do, not me.
If I WOULD do it, I would ask French shit.


too bad there's no way to prove that over the internet.
Click here to hear my BOB DYLAN (Blowing in the Wind) out right now May 2k17
#27
Quote by liampje
Do you actually know the logarythm of dB?

i know that one was wrong. I was guessing. Waves isn't really my strong point what about the rest?
#28
So basically, I'm going to ask you guys some physics question about sound.
1)What happens to the sound if we make the amplitude smaller?
2)A)What is sound exactly?
B)How could we actually proof this?
3)I have got this amp, the highest volume is 50db, what is the dB when the sound is 4x harder?
4)How would we calculate the distance between the source and your ear, you already know this that sound moves 340meters per seconds in air and the time is 3 seconds before the sound gets in your ear from the source?
5)How does sound move through glass?
6)What happens when we put an alarm in a matter free room?


Only gonna try and answer this since it's relevant to my nearing exam.

1. It is observed as quieter.
2. longitudinal waves, i.e. waves in which the movement of particles is parallel to the direction of propogation.
b. it propogates faster through a denser medium, i guess that's evidence
3. 56dB? No idea
4. s=d/t so it's just 330x3... this is stupid
5. same way it moves through anything else, by vibrating the molecules in a certain direction


...

6. this question is ****ing stupid
- - - - - - - -
When I think of the perpetual journey through life
When it always feels like autumn
The wind moves slowly to the north
And the flowers die
Rain falls in my dreams

- - - - - - - -
#29
Quote by lushacrous
From now on, every single time I learn something new in class, I'm going to make a thread quizzing everybody on it. Just 'cause.

This thread is lame and pointless.

You know, assuming that you don't see the link between GUITARIST and SOUND, I'll explain it to you.
A guitarist has a guitar, when he plays it it makes sound.
And if this thread is lame and pointless why would you even bother posting here?
#30
Quote by damian_91
When it comes to complex sounds you got an infinite ammount of dBs.

when a question like that is asked in exam, you just assume that it is a uniform sound. How the hell are you supposed to find the answer otherwise?
#31
Quote by papershredder
Only gonna try and answer this since it's relevant to my nearing exam.

1. It is observed as quieter.
2. longitudinal waves, i.e. waves in which the movement of particles is parallel to the direction of propogation.
b. it propogates faster through a denser medium, i guess that's evidence
3. 56dB? No idea
4. s=d/t so it's just 330x3... this is stupid
5. same way it moves through anything else, by vibrating the molecules in a certain direction


...

6. this question is ****ing stupid

Before I had the subject sound in class I couldn't answer 6.
And all the others.
So why not answer 6
#33
Quote by hames jetfield
when a question like that is asked in exam, you just assume that it is a uniform sound. How the hell are you supposed to find the answer otherwise?

You can't, because log(dB)=ln|dB|+i*(Arg(dB)+2kpi)
Quote by Pleasure2kill
The truth is, Muslims never apologized for their faith having something to do with the attacks on 9/11.
#34
Quote by hames jetfield
when a question like that is asked in exam, you just assume that it is a uniform sound. How the hell are you supposed to find the answer otherwise?

Haha, I like your style, smart yet cool and serious.
#35
Quote by liampje
You know, assuming that you don't see the link between GUITARIST and SOUND, I'll explain it to you.
A guitarist has a guitar, when he plays it it makes sound.
And if this thread is lame and pointless why would you even bother posting here?

Worst reasoning ever.

In that case, I'm going to make a thread testing people's knowledge of wood, as guitars are made of wood and stuff.

And I'm not sure why I'm posting here, boredrum mostly.
R.I.P. M.C.A.
Tweet at me bro
lushacrous loves you
Quote by blake1221
Don't be ludicrous, lushacrous.
Quote by Gunpowder
that joke regarding your username was NOT originally posted by blake1221. That was a Gunpowder original.

I INVOKE SOPA TO SMITE YE FOR THIS FALSEHOOD.
#37
Quote by liampje
Before I had the subject sound in class I couldn't answer 6.
And all the others.
So why not answer 6


There's no such thing as a matter free room. No such thing as true nothingness or absolute zero either

If you mean in a vacuum, then the sound just wouldn't propogate because it needs a medium. I don't know if that's what you're looking for though
- - - - - - - -
When I think of the perpetual journey through life
When it always feels like autumn
The wind moves slowly to the north
And the flowers die
Rain falls in my dreams

- - - - - - - -
#38
Quote by damian_91
You can't, because log(dB)=ln|dB|+i*(Arg(dB)+2kpi)

lol wut?
I'm not a James Hetfield fan
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#39
Quote by papershredder
There's no such thing as a matter free room. No such thing as true nothingness or absolute zero either

If you mean in a vacuum, then the sound just wouldn't propogate because it needs a medium. I don't know if that's what you're looking for though

I meant no matter to bring the sound away, or however you call that in English.
#40
Quote by hames jetfield
i know that one was wrong. I was guessing. Waves isn't really my strong point what about the rest?

The rest was all good.
The logarythm of Decibel is every 3 decibel you multiply it by 2.
So: +3=2xloud +6=4xloud +9=8xloud etc.
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