Unit 3 Post-Assessment Review

Mechanical waves can be either transverse or longitudinal/compressional.

• transverse - ocean waves (crests, troughs, wavelength, amplitude, frequency)

• longitudinal/compressional - sound waves (compressions, rarefactions)

Mechanical - Require a medium

​The electromagnetic spectrum consists of different frequencies and wavelengths, but each type of wave moves at the same speed - the speed of light.

Electromagnetic - Does NOT require a medium

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​LIght bounces off a surface

Reflection

Light appears to bend as it slows down passing from one medium to another

Refraction

Light has to bend around a barrier or an opening.

Diffraction

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• Makes objects smaller

• Causes light to disperse or go outward

Concave

• Makes objects larger

• Causes light to focus at a focal point

Convex

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