Waves

Question 1

What is amplitude

Answer 1

half the crest to trough distance

Question 2

what is wavelength

Answer 2

the distance between any part of the wave and the next part where the wave repeats itself

Question 3

what is frequency

Answer 3

the number of waves produced in 1 second

Question 4

what is period

Answer 4

the time it takes to make 1 wave

Question 5

what is a wavefront

Answer 5

a line joining together similar points on a wave

Question 6

what are transverse waves

Answer 6

Waves that vibrate or oscillate perpendicular to the direction of energy transfer

Question 7

what are longitudinal waves

Answer 7

oscillations occur parallel to direction of energy

Question 8

what is frequency measured in

Answer 8

Hertz (Hz)

Question 9

what is the doppler effect

Answer 9

if the wavelength is greater the source is moving away
if the wavelength is less the source is moving twards us

Question 10

what is the electromagnetic spectrum (in order shortest - longest)

Answer 10

gamma rays
x - rays
ultraviolet
visibe
infared
microwaves
radio

Question 11

what is the electromagnetic spectrum for light (in order shortest - longest)

Answer 11

indigo
blue
green
yellow
orange
red

Question 12

what kind of waves are light waves

Answer 12

transverse waves

Question 13

what can be done light waves

Answer 13

they can be reflected and refracted

Question 14

what is the law of reflection

Answer 14

angle of incidence = angle of reflection

Question 15

explain the image in a mirror

Answer 15

same size as object
distance from mirror to object = distance from image to mirror
laterally inverted

Question 16

what bends twards the normal

Answer 16

light going from air to glass

Question 17

what bends away from normal

Answer 17

light going from glass to air

Question 18

what is the cirtical angle

Answer 18

the angle of incidence for which the angle of refraction is 90 degrees

Question 19

what is total internal relfection

Answer 19

if the angle is bigger than the cirtical angle

Question 20

what are examples of total internal reflection

Answer 20

periscope
endoscope
fiber optics

Question 21

what kind of wave is a sound wave

Answer 21

longitudinal wave

Question 22

how can a sound wave be refracted

Answer 22

if it travels from one density (temperature) to another

Question 23

what does high frequency mean

Answer 23

a sound with a high pitch

Question 24

what is the range of human hearing

Answer 24

20Hz - 20000 Hz

Question 25

what does it mean if the wave is further apart

Answer 25

quite and low pitched

Question 26

what does it mean if the waves are close together

Answer 26

loud and high pitched

Question 27

how can you investigate the speed of sound

Answer 27

using a clapper board one person stands away and they start the stopwatch when they see the clapper board touch and then stop when they hear the sound

Question 28

how are microwaves a hazard

Answer 28

they can cause internal heating of body tissues

Question 29

how is ultraviolet light a hazard

Answer 29

increases the rish of skin cancer and blindness

Question 30

what are radio waves used for

Answer 30

radio and television communications

Question 31

what are microwaves used for

Answer 31

satellite transmissions and cooking

Question 32

what is infared radiation used for

Answer 32

heaters and night vision equipment

Question 33

what is visible light used for

Answer 33

fibre optics and photography

Question 34

what is ultraviolet used for

Answer 34

fluorescent lamps

Question 35

what are x - rays used for

Answer 35

medical imaging and security

Question 36

what is gamma radiation used for

Answer 36

sterillising food and medical equipment