Question

Look at the information about waves.

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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 through.

C.
Some 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 crests.

E.
In electromagnetic waves, a wavelength is determined by measuring the distance between two consecutive compressions.

Answer 1

B, C, and D.

- B: Mechanical waves can be transverse (particle motion perpendicular) or longitudinal (particle motion parallel) to the direction of propagation.
- C: Longitudinal mechanical waves have compressions and rarefactions, not crests.
- D: Electromagnetic waves are transverse, so wavelength is the distance between successive crests (or successive troughs).