Em Waves

Question 1

Order of frequency

Answer 1

Radio waves , microwaves, infrared, visible lights, ultraviolet, X-rays, gamma rays
Radio waves- longest wavelength, lowest frequency
Gamma rays- shortest wavelength, highest frequency

Question 2

Properties

Answer 2

Can travel through vacuum
Travel same speed in vacuum - 3x10^8
When travelling from one medium to another, speed and wavelength changes, freq does not change
Obey law of reflection and refraction

Question 3

Radio waves

Answer 3

Radio, television, communication

Question 4

Microwaves

Answer 4

Microwave oven

Satellite tv

Question 5

Infrared

Answer 5

Remote controllers

Intruder alarm

Question 6

Visible light

Answer 6

Optical fibres for medical purposes and telecommunications

Question 7

Ultraviolet

Answer 7

Sterilise medical equipment

Sunbeds

Question 8

X-rays

Answer 8

Medical use

Engineering applications

Question 9

Gamma rays

Answer 9

Radiation therapy

Question 10

Effect of em waves

Answer 10

Sunburn
Skin cancer
Premature ageing
Damaging biological molecules