1. Waves Unit Review

2. 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

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

4.  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

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

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

7. False
False
True
True
False
True
False
False
False
True
False
True
True

8. absorbs
Ultraviolet
Visible
Infrared

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

10. 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