Question

Which THREE statements are TRUE about mechanical and electromagnetic waves? A In all mechanical waves, the amplitude is the distance from the medium to the crest of the wave. B Particles in mechanical waves can travel perpendicular or parallel to the medium they are traveling throughCSome mechanical waves lack a crest because the particles move parallel to the medium they are traveling through D In electromagnetic waves, a wavelength is determined by measuring the distance between two consecutive cresis EIn electromagnetic waves, a wavelength is determined by measuring the distance between two consecutive compressions

Answer 1

The statements that are true are, Statement B, statement C and statement D.

Not all mechanical waves have crests. Transverse waves have crests and troughs and longitudinal waves have compression and rarefactions. Thus statement A is not true.

Mechanical waves have two main types. In transverse waves, the particles of the wave travel perpendicularly and in longitudinal waves, they travel parallelly. Therefore, statement B is true.