1. The problem statement, all variables and given/known data A source of sound frequency 550 Hz emits waves of wavelength 600 mm in air at 20 °C. What is the velocity of sound in air at this temperature? What would be the wavelength of the sound from this source in air at 0 °C? Answers: 330 m s-1, 579 mm 2. The attempt at a solution v = f λ = 550 * 0.6 = 330 m s-1 Regarding the wavelength of the sound at 0 degrees I am not sure what to do. I looked up here that 0 degrees have a speed of 331.01 m s-1, so λ = v / f = 0.601 m or 602 mm. Which is wrong. I also substituted 20 °C and got 343 m s-1. Why does the number differ with the one I got (330 m s-1)?