1. The problem statement, all variables and given/known data Sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. Such a loudspeaker is mounted outside on a pole. In winter, when the temperature is 273 K, the diffraction angle θ has a value of 11°. What is the diffraction angle for the same sound on a summer day when the temperature is 307 K? 2. Relevant equations v=sqrt([itex]\gamma[/itex]kT/m) v=[itex]\lambda[/itex]f sin[itex]\theta[/itex]=[itex]\lambda[/itex]/D 3. The attempt at a solution I can't seem to relate these equations. I know that [itex]\gamma[/itex]k/m is constant for both T and I also know that v increases with temperature but I don't understand how that affects lambda and frequency.