A sound wave with a pitch of 261.6Hz (middle C) is played in a warm concert hall, where the air temperature is 25∘25∘C. A passer-by in the cold winter street outside hears the note coming through a window. The air temperature outside is −5∘−5∘C.
What will be the wavelength of the sound wave in the warm concert hall? Give an answer accurate to at least 2 decimal places.