lesson 6

Question 1

light is made when…
this is because…

Answer 1

1.a charged particle accelerates
2.a moving charge creates a moving electric field, and a moving electric field creates a moving magnetic field. the result is a self-propagating electr-magnetic wave, also known as light

Question 2

how does light transfer energy

Answer 2

1. travels through a vacuum easily bc nothing to stop or absorb the wave. when it hits a material, particles may be absorbed as the charged particles may “ride the wave” and vibrate more

Question 3

speed of light

Answer 3

300 000 000m/s

Question 4

wave equation

Answer 4

v = f x lambda

Question 5

frequency equation

Answer 5

f = 1/T

Question 6

short –> long wavelength

Answer 6

gamma ray, x ray, ultraviolet, visible, infrared, microwave, radio

Question 7

low –> high energy

Answer 7

radio, microwave, infrared, visible, ultraviolet, x ray, gamma ray

Question 8

low –> high frequency

Answer 8

radio, microwave, infrared, visible, ultraviolet, x ray, gamma ray

Question 9

radio size

Answer 9

1m +

Question 10

radio uses

Answer 10

communication devices

Question 11

radio dangers

Answer 11

none

Question 12

microwave size

Answer 12

1m - 0.001m

Question 13

microwave uses

Answer 13

communication, medicine, customer use

Question 14

microwave dangers

Answer 14

certain frequencies heat water which could burn

Question 15

infrared size

Answer 15

1mm

Question 16

infrared uses

Answer 16

heat lamps, remote controls and IR detectors

Question 17

infrared dangers

Answer 17

overexposure can lead to burns

Question 18

visible light size

Answer 18

400-700 x 10^-9m

Question 19

visible light uses

Answer 19

seeing

Question 20

visible light daners

Answer 20

overexposure can lead to burns or blindless(looking at sun)

Question 21

ultraviolet size

Answer 21

400-10 x 10^-9 m

Question 22

ultraviolet uses

Answer 22

produce vitamin D in skin
sterilise bacteria

Question 23

ultraviolet dangers

Answer 23

cell damage, skin cancer, death

Question 24

x ray size

Answer 24

10 - 0.001 x 10^-9

Question 25

x ray uses

Answer 25

seeing inside things e.g. broken bones

Question 26

x ray dangers

Answer 26

cell damage, cancer, death

Question 27

gamma ray size

Answer 27

10^-12 m

Question 28

gamma ray uses

Answer 28

kill bacteria, treat cancer

Question 29

gamma ray dangers

Answer 29

cell damage, cancer, death