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anonymous one year ago help me in this problem about sound please

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1. anonymous

2. Astrophysics

Ok, lets do a first, did you attempt it?

3. Astrophysics

$T_{15} = 288.15 K~~~\text{and}~~~T_0 = 273.15K$ and you need to find $\frac{ T_{15} }{ T_0 }$ at this point it's plug and chug

4. Astrophysics

Hey, are you there?

5. anonymous

hey! , I'm sorry for the delay.. I was studying :( . I think that nobody was going to answer me u_u . Are you there?

6. Astrophysics

Hey, did you try the problem?

7. anonymous

hey, I don't know what equation i have to use . :(

8. Michele_Laino

I think that we have to use this equation for the sound speed v_S: $\Large {v_S} = \sqrt {\frac{{\gamma RT}}{M}}$ where R is the gas constant, \gamm is the ratio C_p/C_v between specific heats at constant pressure and volume, and M is the mass of a mole of our gas

9. Michele_Laino

so we can write: $\Large \frac{{{v_S}\left( {{T_{15}}} \right)}}{{{v_S}\left( {{T_0}} \right)}} = \sqrt {\frac{{{T_{15}}}}{{{T_0}}}} = \sqrt {\frac{{288.15}}{{273.15}}} = ...$

10. Astrophysics

We need to use $v_{sound} = \sqrt{\frac{ \Gamma RT }{ M }}$ where gamma is a constant, R is gas constant, M is molecular mass of gas, and T is absolute temperature is what I can find as far as the second problem goes http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe3.html for the third problem it seems we will need to know the doppler effect.

11. Astrophysics

Yes exactly @Michele_Laino haha!

12. Michele_Laino

:) @Astrophysics we gave the answer at the same time

13. Astrophysics

I was looking for the relationship as I could not recall it, but I knew it has to do with a gas constant from chemistry and it was the same one you seem to have used!

14. Michele_Laino

yes! you are right!

15. Astrophysics

:)

16. Michele_Laino

@baad1994

17. anonymous

thank you guys @Michele_Laino @Astrophysics .. i really appreciate your help.

18. Astrophysics

Np :)

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