A source of sound waves approaches a stationary observer through a uniform medium. Compared to the frequency and wavelength of the emitted sound, the observer would detect waves with a? A) Higher freq

A source of sound waves approaches a stationary observer through a uniform medium. Compared to the frequency and wavelength of the emitted sound, the observer would detect waves with a? A) Higher frequency and shorter wavelength B) Higher frequency and longer wavelength C) Lower frequency and shorter wavelength D) Lower frequency and longer wavelength