
#1
Oct505, 08:03 PM

P: 1

Okay, here is my approach. Let me know if you think it makes sense.
We have c = f\lambda and [tex] c = \sqrt{(\gamma RT)/M} [/tex]. In the fundamendal mode, \lambda = 2L. So 2f_\mathrm{He}L = \sqrt{(\gamma_\mathrm{He}RT)/M_\mathrm{He}} (1) and 2fL = \sqrt{(\gamma_\mathrm{air}RT)/M_\mathrm{air}} (2) Dividing (1) by (2), f_\mathrm{He}/f = \sqrt{(\gamma_\mathrm{He}M_\mathrm{air})/(\gamma_\mathrm{air}M_\mathrm{He})} so f_\mathrm{He} = f\sqrt{(\gamma_\mathrm{He}M_\mathrm{air})/(\gamma_\mathrm{air}M_\mathrm{He})} 



#2
Oct505, 08:34 PM

P: 212

your latex is fed up



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