The source of all waves is vibrating matter. In a transverse wave, amplitude is the height of a crest or depth of a trough. Wavelength is the distance between two successive similar points on a wave. The frequency of a wave is the number of waves per second. The period is the time of one complete wave to pass.
Frequency is the inverse of the period and vice versa.
The wavelength decreases. The vibrations are perpendicular to the direction. The vibrations are parallel to the direction. Compression and rarefaction density is compared to the amplitude of the crests and troughs of transverse waves. Distinguish between constructive interference and destructive interference.