1. it is the time it takes to complete a wave cycle?
2. these are waves where the particle of the medium vibrates perpendicular to the direction of wave motion.
3. it is the number of wave cycles completed per unit time.
4. it carries energy as it propagates through space.
The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years. The period of orbit for the Earth around the Sun is approximately 365 days; it takes 365 days for the Earth to complete a cycle
A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves
frequency
Electromagnetic radiation (EMR) carries energy—sometimes called radiant energy—through space continuously away from the source (this is not true of the near-field part of the EM field). Electromagnetic waves can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields
