What is the wavelength of a sound wave that has a speed of 340 m/s and a frequency of 880 hz? what is the wavelength of a sound wave that has a speed of 250 m/s and a frequency of 400 hz? what is the wave speed of a wave that has a frequency of 50 hz and a wavelength of 2.0 m? what is the wave speed of a wave that has a frequency of 100 hz and a wavelength of 0.50 m?