Features of A Wave Crest and Trough Crest: ____________________________ Trough: ___________________________ As an object moves along the wave it moves up and down. Amplitude Amplitude: ________________________________________________________________________________. Amplitude Features of A Wave Section 4.2 Wavelength Wavelength: _____________________________________________________________________. Frequency Frequency (measured in Hz, cycles/s): __ Frequency = __Wavelength __ Frequency = __ Wavelength High Frequency Low Frequency