Answer: Frequency
Step-by-step explanation:
A transverse wave has crests and troughs. one trough and one crest form a wave. A wave can be described by its wavelength, frequency, period and speed.
Frequency (f) can be defined as the number of waves or crests or number of troughs that pass a point per unit second. It can be measured in Hertz (Hz) or 1/s.
Wavelength (λ) is the distance between two consecutive crests or troughs.
Period is the inverse of frequency.
T = 1/f
Product of wavelength and frequency gives the speed of the wave.
v = λ f