Uses and Dangers of Electromagnetic Radiation

Question 1

How are electromagnetic waves used for communication?

Answer 1

Phone - communicates with transmitters using microwaves
Microwaves - use to communicate with satellites
TV and Radio - transmit TV and radio signals by adding sound and picture information to radiowaves
Remote Controls - use infrared pulses
Ships - communicate with flashing light (morse code)

Question 2

What are the other uses of Electromagnetic Waves?

Answer 2

Microwave Oven - water and ft absorb microwaves
Infrared Radiation - Cooks food in grill/oven, used in radiators
Lasers use Visible Light - for CDs, DVDs
Ultraviolet Radiation - helps produce vitamin D
Ultraviolet light - detects forged bank notes, used by forensic scientists

Question 3

What wave types can kill/damage cells?

Answer 3

Ultraviolet
X-Rays
Gamma Rays