A stationary person makes observations of the
periodic waves produced by a moving source.
When the wave source recedes from the

Question

A stationary person makes observations of the periodic waves produced by a moving source. When the wave source recedes from the observer, he observes an apparent increase in the wave's 
(1) speed 
(2) frequency 
(3) wavelength
(4) amplitude

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A stationary person makes observations of the periodic waves produced by a moving source. When the wave source recedes from the observer, he observes an apparent increase in the wave's (1) speed (2) frequency (3) wavelength. (4) amplitude