
#1
Nov3006, 03:13 PM

P: 6

1. The problem statement, all variables and given/known data
Predict the effect temperature will have on the frequency of the string (considering your results and your knowledge of science). Explain and back up your hypothesis 2. Relevant equations http://img166.imageshack.us/img166/2544/lvsfie2.jpg 3. The attempt at a solution Nothing so far. I'm clueless. 



#2
Nov3006, 03:28 PM

Emeritus
Sci Advisor
PF Gold
P: 4,975

What happens to a solid as you heat it? Think of the graphs that you have provided because they will come in handy when you know what happens to heated solids.




#3
Nov3006, 06:49 PM

P: 6

The molecules move faster. So, if you increase the temperature, the frequency will increase? Where do the graphs tie into this?




#4
Nov3006, 07:07 PM

Mentor
P: 39,575

The effect of temperature on frequency 



#5
Nov3006, 07:59 PM

P: 6

Ok, so, if you heat up the string, it becomes bigger (longer)  tension decreases. According to the graphs, when the length is increased, the frequency decreases. Same with tension. Is that right? If yes, where should I start to figure out the actual relationship?




#6
Nov3006, 08:03 PM

Emeritus
Sci Advisor
PF Gold
P: 4,975

The question just asks you to predict so you need not know the exact relationship. State what happens to the string when its heated and what happens to the frequency due to that or those particular parameters being changed.




#7
Nov3006, 08:21 PM

P: 6

Thanks everyone!!!




#8
Dec206, 03:36 PM

P: 6

Does the wave length of the sound change is the temperature is increased?
If not, when the temperature increases, doesn't the speed of sound increase? Which using the universal wave equation v = f x lamba, the frequency would increase in order to have the speed increase? Not sure, if there is anything else I am not taking into account. 



#9
Dec206, 04:30 PM

Engineering
Sci Advisor
HW Helper
Thanks
P: 6,339

Yes, the speed of sound in air increases with temperature, but that's not relevant here. The frequency is fixed by the vibration of the string, not the air.
The wavelength of the sound in the air is not the same as the length of the string! Think what happens to a guitar string when you change the frequency by changing the tension (by turning the the tuning peg) and the length is constant. In the string, the wave speed is changes and the wavelength is constant. In the air, the wave speed is constant and the wavelength changes. 



#10
Dec206, 04:40 PM

P: 6

Thanks... I understand it now.



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