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the amount of energy a wave carries corresponds to its
is equal to the number of wavelengths that pass a fixed point in a second.
frequency is typically expressed in

Frequency is typically expressed in Hertz.

Explanation:

Frequency is the measure of number of complete cycles completed in a given time interval. In terms of wavelength, frequency is inversely proportional to wavelength with velocity of light being the proportionality constant.

So the unit used to express frequency is Hertz. It can be also termed as the amount of energy a wave carriers corresponding to the number of wavelengths that pass a fixed point in a second.

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

the answer would be   dignified - apex