Chapter 13 em waves

Question 1

Characteristic of em waves

Answer 1

transverse
travel at 3x10^8 in vacuum
em waves transfer energy
v=fa

Question 2

What happens when wave travel to another media

Answer 2

speed and wavelength decrease
freq the same

Question 3

relationship iof em waves

Answer 3

higher temp higher freq of em waves

Question 4

Electromagnetic spectrum

Answer 4

radiowave 10-1
microwave 10-2
infrared 10-3
visible light 10-6
ultraviolet 10-8
xray 10-8
gamma ray 10-12
(rmivuxg)

Question 5

Harmful effects of overexposure

Answer 5

sunburn
ionising radiation

Question 6

Radio waves

Answer 6

• used in radio and television communications

Question 7

Microwae

Answer 7

use in microwave. satellite teleivision

Question 8

Infrared

Answer 8

used in cooking or keep warm

Question 9

visible light

Answer 9

photography and photographic

Question 10

Ultraviolet

Answer 10

photography and photographi, sunbedc

Question 11

x-ray

Answer 11

disinfection and medical radio