Waves Unit Review

Ultraviolet rays have a high frequency (short wavelength) which means they carry a lot of energy. This can harm the human body: Skin Cancer Sunburn Skin Aging Damage to Immune System

Sound travels faster in denser mediums Light travels slower in denser mediums

 Absorbs the light and transforms it into thermal energy  Acts like a mirror and reflects the light waves  Absorbs the light and transforms it into thermal energy

Sunglasses B  0% transmission Sunglasses A  20 % transmission Sunglasses B  100 % transmission Blue/Green/Yellow Sunglasses A  30-40% transmission

Sunglasses A & B  Violet Sunglasses A  20% transmission Sunglasses A  Only 20% transmission of UV rays

False False True True False True False False False True False True True

absorbs Ultraviolet Visible Infrared

Frequency Wave 1 = 6 ÷ 3 = 2 Hz Frequency Wave 2 = 12 ÷ 4 = 3 Hz

Reflection Transmission Aluminum Plastic Wrap Absorption Black Paper Objects that we see as black are absorbing all wavelengths of visible light. Once absorbed, the light energy is transformed into thermal energy. Reflection Aluminum Transmission Plastic Wrap Absorption Black Paper