Electromagnetic Spectrum, Waves

Question 1

Electromagnetic waves all travel at the same…….in free space

Answer 1

Speed

Question 2

What speed do traverse waves travel at

Answer 2

Speed of light

Question 3

What can electromagnetic waves travel through

Answer 3

a vacuum

Question 4

Electromagnetic waves have different…….and………

Answer 4

Wave lengths and frequencies

Question 5

Give the order for the electromagnetic spectrum

Answer 5

Radio waves
Microwaves
Infrared Radiation
Visible light
Ultra-violet
Xrays
Gamma rays

Question 6

What does the electromagnetic spectrum go up in decreasing….

Answer 6

Wave lengths

Question 7

Give a use for Radio waves

Answer 7

broadcasting and telecommunications

Question 8

Give a use for microwaves

Answer 8

longitudinal and satellite transmission

Question 9

Give a use for Visible light

Answer 9

Optical fibres and daylight

Question 10

Give a use for Ultra violet light

Answer 10

Hidden messages, crime prevention

Question 11

Give a use for X rays

Answer 11

Observing the internal structures of objects and materials

Question 12

Give a use for Gamma rays

Answer 12

sterilising food and hospital equipment

Question 13

Give a danger for Microwaves

Answer 13

Internal heating of body tissue

Question 14

Give a danger for Infra-red radiation

Answer 14

Skin burns

Question 15

Give a danger for Ultra violet light

Answer 15

Damage to surface skin cells, (cancer), and blindness

Question 16

Give a danger for Gamma rays

Answer 16

Cancer, genetic mutation

Question 17

In traverse waves each point of the wave is moving …….to the direction in which the ….. of the wave is moving

Answer 17

Perpendicular

Energy

Question 18

Give a transverse wave that is not part of the electromagnetic spectrum

Answer 18

Mexican waves

Question 19

In longitudinal waves the energy travels….. to the direction of travel

Answer 19

Parallel

Question 20

Give the relationship between speed, frequency and wave length of a wave.

Answer 20

Speed = Wavelength x Frequency

Question 21

Give the relationship between frequency and time of a wave.

Answer 21

Frequency = 1 ÷ time

Question 22

Give an example of a longitudinal wave

Answer 22

Sound waves

Question 23

What is frequency measured in

Answer 23

Hertz (KHz)

Question 24

Define Frequency

Answer 24

The number of waves per second

Question 25

Define the time period

Answer 25

The time it takes one complete wave to pass, (in seconds)

Question 26

What are the areas called in a longitudinal wave where the waves are most spread out

Answer 26

Rarefactions