The Doppler Effect describes a frequency shift in reflected waves in proportion to the relative speed between the receiver and the reflected object.
For instance, in a radar speed trap, the frequency shift in reflected radio waves allows the unit to calculate the speed toward (higher frequency) or away from (lower frequency) the transmitter/receiver unit.
When you drive past a steady noise source, such a bell or a horn, the sound has a higher frequency as you approach and a lower frequency as you depart.
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Increasing the speed of the plunger will increase the frequency of the waves.
When working with waves ... or even just talking about them ... (frequency) = (speed) divided by (wavelength) (wavelength) = (speed) divided by (frequency) (frequency) times (wavelength) = (speed)
The product of (wavelength) times (frequency) is the speed.
Whatever the wavelength and frequency happen to be, their product is always equal to the speed.
speed of a wave = wavelength x frequency = 2.5m x 4Hz = 10m/s