Waves

Question 1

What do waves carry?

Answer 1

Energy from one place to another and also information.

Question 2

What examples of longitudinal waves?

Answer 2

Soundwaves travelling through air.

Question 3

What are examples of transverse waves?

Answer 3

The ripples on a Water surface, electromagnetic waves.

Question 4

What do Longitudinal waves have ?

Answer 4

Rarefractions
Compressions

Question 5

What is Amplitude?

Answer 5

The maximum displacement of a point on a wave away from it’s undisturbed position.

Question 6

What is the Wavelength ?

Answer 6

It is the distance from one point on a wave to the equivalent point on the adjacent wave.

Question 7

What is the frequency of a Wave?

Answer 7

The number of waves passing a point each second.

Question 8

What is Wave speed?

Answer 8

The speed at which energy is transferred or the wave moves through the medium.

Question 9

What is wavelength measured in?

Answer 9

Meters

Question 10

What is Frequency measured in ?

Answer 10

Hertz

Question 11

What is the period measured in?

Answer 11

Seconds

Question 12

What is Wave speed measured in?

Answer 12

Meters per seconds

Question 13

What are Electromagnetic Waves?

Answer 13

They are transverse waves which transfer energy from the source of the waves to an absorber.

Question 14

How are the Electromagnetic Waves grouped?

Answer 14

From Long Wavelength to Short Wavelength
From Low frequency to Short Frequency.

Question 15

What is the Analogy for Electromagnetic Waves?

Answer 15

Red
Meat
Is
Unhealthy
eXcept
Giraffe

Question 16

Can humans detect Electromagnetic Waves easily?

Answer 16

No, our eyes only detect visible light and so only detect a limited range of waves.

Question 17

How can waves be transfered from location to location?

Answer 17

Different substances may absorb, transmit, refract or reflect electromagnetic waves that vary with wavelength.

Question 18

What does refraction relate to?

Answer 18

The difference in velocity of the waves in different substances (look at wave front diagrams )

Question 19

How can Radio Waves be produced ?

Answer 19

They are produced by oscillations in electrical circuits.

Question 20

What happens when Radio Waves are absorbed?

Answer 20

They may create an alternating current with the same frequency as the the radio wave itself, so radio waves can themselves induce oscillations in an electrical circuit.

Question 21

How do changes in nuclei and and atoms relate to electromagnetic waves?

Answer 21

They can result in electromagnetic waves being generated or absorbed over a wide frequency range

Question 22

Which 3 waves can have a hazardous effect on human body tissue ?

Answer 22

Ultraviolet Light
Gamma rays
X-rays

Question 23

What does the damage of human body tissue rely on?

Answer 23

The radiation
Size of the radiation dose (needs to be measured and regulated)

Question 24

What harmful about Ultraviolet light?

Answer 24

It can cause skin to age prematurely and increase the risk of skin cancer.

Question 25

What’s harmful about Gamma radiation

Answer 25

It can cause cancer and the mutation of genes.

Question 26

What are Radio Waves used for ?

Answer 26

Television and radio

Question 27

What are microwaves used for ?

Answer 27

Satellites, Communications and Cooking food

Question 27

What are infared waves used for ?

Answer 27

Electrical heaters, Cooking food, Infared cameras

Question 28

What is visible light used for ?

Answer 28

Fibre optic communications

Question 29

What is Ultraviolet Light used for?

Answer 29

Energy efficient lamps, Sun tanning

Question 30

What are X-rays and Gamma rays used for ?

Answer 30

Medical imaging and treatments.