It is standard to tune the piano key for A above middle C to 440 Hz. This is called A440 tuning. At 20 degrees Celsius (room temperature), what is the wavelength in air of this note? Give your answer in m/s, without scientific notation

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).