Electromagnetic Spectrum

Question 1

What is wavelength?

Answer 1

The length of a full cycle

Question 2

What is amplitude?

Answer 2

Distance between the rest position and crest

Question 3

What is frequency?

Answer 3

Number of complete waves per second

Question 4

What is the unit for frequency?

Answer 4

Hz

Question 5

Give an example of a transverse wave

Answer 5

Light and all other electromagnetic waves

Question 6

What is a longitudinal wave?

Answer 6

Vibrations along the same line

Question 7

Give an example of a longitudinal wave

Answer 7

Sound waves

Ultrasound

Question 8

Give two properties of all electromagnetic waves

Answer 8

Transverse 
Same speed (through air)

Question 9

What is the equation for wave speed?

Answer 9

Speed = frequency x wavelength

Question 10

What is the unit for speed?

Answer 10

M/s

Question 11

What is the unit for wavelength?

Answer 11

M

Question 12

What is the rule for reflection?

Answer 12

Angle of incidence = angle of reflection

Question 13

What is refraction?

Answer 13

Ray goes through a material and changes direction

Question 14

What is diffraction?

Answer 14

All waves diffract at the edges when passing through a gap or an obstacle

Question 15

What happens hen a wave goes through a gap much wider than it’s wavelength?

Answer 15

Little diffraction

Question 16

What happens when a wave goes through a gap a little bit wider than wavelength?

Answer 16

Diffraction only at edges

Question 17

What happens when waves go through a gap the same as wavelength?

Answer 17

Maximum diffraction

Question 18

When do waves refract?

Answer 18

When they meet a new medium at an angle

Question 19

Electromagnetic spectrum (longest to smallest wavelength)

Answer 19

Radio waves
Microwaves
Infrared
Visible light 
Ultraviolet
X-rays
Gamma rays

Question 20

What is the main use of radio waves?

Answer 20

Communication

Question 21

What are satellite waves used for?

Answer 21

Satellite communication

Mobile phones

Question 22

What are infrared waves used for?

Answer 22

Remote controls

Optical fibres

Question 23

What are visible light waves useful for?

Answer 23

Photography

Question 24

What is the shortest wavelength?

Answer 24

Gamma rays

10^-15m

Question 25

What is the longest wavelength?

Answer 25

Radio waves | 10^4m

Question 26

What is the link between frequency and wavelength for electromagnetic waves?

Answer 26

Higher frequency | Shorter wavelength

Question 27

How does frequency affect he pitch of a sound wave?

Answer 27

Higher frequency = high pitch | Low frequency = low pitch

Question 28

What is frequency for sound waves?

Answer 28

Number of complete vibrations each second | 100Hz = 100 vibrations per second

Question 29

What effect does the amplitude have on a sound wave?

Answer 29

Bigger amplitude | Louder sound

Question 30

What is an ionosphere?

Answer 30

An electrically charged layer in the Earths upper atmosphere