Waves

Question 1

What differentiates electromagnetic waves?

Answer 1

wavelength and frequency

inversely realted- one goes up other goes down

Question 2

Name the elctromagnetic waves in order

Answer 2

radiowaves, micro waves, infared,visibile light, ultra violet, x rays, gamma rays

as you go to the right- wave length decreases

as you go to the right frequency increases.

Question 3

What electromagnectic wave can humans detect?

Answer 3

visible light- all colours

Question 4

How are gamma rays emitted?

Answer 4

byy radioactivity

Question 5

How is visible light, ultra violet and x rays emitted?

Answer 5

by electrons dropping energy levels

Question 6

How is infared emitted?

Answer 6

bu bonds holding molecules together vibrate.

Question 7

What happens to waves after being emitted?

Answer 7

they can be transmitted, reflected or absorbed.

Question 8

What is a amplitude?

Answer 8

maximum displacement of a point on a wave from it’s undisturbed posiiton.

Question 9

What is a wavelength?

Answer 9

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

Question 10

What is frequency?

Answer 10

number of waves passing a point each second

Question 11

What is frequency measured in?

Answer 11

hertz Hz

1Hz= 1 wave per second.

Question 12

What is the period?

Answer 12

amount of time in seconds for a wave to pass a point

Question 13

How are waves produced?

Answer 13

changes take place in the atom or nuclei of an atom when waves are generated or absorbed.

Question 14

Which waves are hazardous to the human body?

Answer 14

gamma rays, ultra violet, xrays

Question 15

What can ultraviolet waves cause?

Answer 15

skin to premature early and skin cancer

Question 16

What waves are ionising radiation?

Answer 16

x rays and gamma rays

Question 17

What do x rays and gamma rays cause?

Answer 17

skin cancer and mutation of genes

Question 18

How can radio waves be produced?

Answer 18

when electrons oscillate in electric currents.

Question 19

What are the uses of radiowaves?

Answer 19

used to transmit radios and terrestial tv signals.

Question 20

Why are radio waves used?

Answer 20

can travel long distances without being absorbed.

spread out between hills

Question 21

What are microwaves used for?

Answer 21

to heat up food.

Question 22

Why are microwaves used ?

Answer 22

energy causes temperature of food to increase

used to communicate with satellites in space as they don’t reflect or refract in earth’s atmosphere.

Question 23

What are the uses o infared?

Answer 23

used for heater and cook food in oven.

Question 24

Why is infared used?

Answer 24

energy of infared easily absorbed by surface of objects.

infared cameras to check for heat loss in buildings.

Question 25

What are the uses of visbile light?

Answer 25

communication using fibre optics.

optical fibres used to carry telephone and cable tv signals.

short wave length carry great amount of imformation.

Question 26

What are the uses of ultraviolet?

Answer 26

used for lightbulbs.

sun tanning

Question 27

Why is ultra violet used?

Answer 27

shortwave length carries more energy than visible light.

Question 28

How is ultraviolet converted to visible light?

Answer 28

energy of ultraviolet absorbed by internal surface of bulb and converted into visible light. (requires less energy)

Question 29

What are x rays and gamma rays used for?

Answer 29

medical imaging.

Question 30

Why are x rays and gamma rays used ?

Answer 30

x rays can detect broken bones

gamma rays can detect cancers.

Question 31

Are gamma rays and x rays prenetative?

Answer 31

yes- easily pass through body tissue.

x rays are absorbed by bones.

Question 32

Can gamma rays and x rays be used for medical tretaments?

Answer 32

to treat cancer.