Would be the frequency in the phonon. Making the approximation which the frequency is inversely proportional for the wavelength, must be decided and used as being the value from the conventional sonic velocity c s . displaystyle c_ s . Accepted papers is going to be published repeatedly within the https://www.facebook.com/permalink.php?story_fbid=pfbid02jb53zu37QofZaLs88eBqzFXUb2bsn9emnCe9SDetdXnMhjyKp2T8VSzPYq63sA8fl&id=61562415773754&__cft__[0]=AZV9GJ-yMKq9mQddCX42hzY0H0Jr9efr-31TAcozHBw-WUp2v0TfBoDMTy68ehWnU7d5ePACBGBx07whPNqakCxWA1l9NIDJQ_mVerxNagBWZEhewo1iIxjOmdveZZEChgSuXFWuk-KaitLBrX-B6FwtXpAQSyKQgzDVDKijO5Z6J24rfFgo-KEVWY0tgMiVN5gcKi5XC99-GzlyoxpUAPDj&__tn__=%2CO%2CP-R