Chapter 15

Question 1

Light waves

Answer 1

Visible light
Red - linger wave length, lover frequency
Violet - shorter wave length, higher frequency

Red light = 7x10^-7 = 0.7micro Meters wave length
Violet light = 4x10^-7 = 0.4 micro meters wavelength

Question 2

Infrared radiation (heat radiation)

Answer 2

Examples: heating elements, aircrafts for weather forecasting. monitoring heat lose from buildings, alarms and location victims of earthquakes
Remote controls use infrared

Question 3

Ultra violet rays UV

Answer 3

Example: sun tan, produce vitamins but can penetrate deeper causing skin cancer

Question 4

Radio waves

Answer 4

Use to broadcast radio and television signals

Radio and television communications

Question 5

Microwaves

Answer 5

Satellite television, telephones and microwave ovens

Question 6

Infrared example

Answer 6

Electrical appliances, remote controllers for television and intruder alarms

Question 7

X rays

Answer 7

Used for medicine to detect broken bones. Security for scanning luggage at airports. In industry x ray photographing used to inspect welded joints

Question 8

Gamma rays

Answer 8

Used to kill cancer cells and harmful bacteria in food and on surgical instruments. It is more penetrating and dangerous than x rays

Question 9

Electron magnetic hazards

Answer 9

People who work with x rays must minimize exposure to microwaves

All types of radiation can be hazardous

Question 10

Speed of electromagnetic waves

Answer 10

All of these waves travel at the same speed in a vacuum

They travel at 300000000m/s or 3.0x10^8

Question 11

Refraction of light in a prism

Answer 11

ROY G BIV

Frequency increases from right to left