G9-PHYSICAL SCIENCE-SEM2-REVIEW PACK-part 1

a part of a longitudinal wave where the particles are crowded together

• transverse wave

• compression

• trough

• crest

to be at right angles

• trough

• perpendicular

• longitudinal wave

the highest point of a transverse wave

• rarefaction

• crest

• trough

a wave in which the particles of the medium move perpendicularly to the direction the wave is traveling

• transverse wave

• longitudinal wave

a substance that a wave can travel through

• vibration

• medium

• mechanical waves

• electromagnetic waves

waves that do not need a medium

• vibration

• medium

• mechanical waves

• electromagnetic waves

waves that must have a medium

• vibration

• medium

• mechanical waves

• electromagnetic waves

a complete back-and-forth motion of an object

• vibration

• medium

• mechanical waves

• electromagnetic waves

Which one of these waves must have a medium?

• X-rays

• ocean waves

• microwaves

• visible light

Which one of these waves does not need a medium?

• seismic waves

• ocean waves

• visible light

• sound waves