P12 - Reflection/ Refraction

Question 1

3 effects of a wave at a boundary

Answer 1

-reflection
transmission
-refraction

Question 2

ripple tanks

Answer 2

-used to study waves in controlled conditions
-makes plane waves by moving a straight edge along the water surface
-waves will move at same speed/distance

Question 3

plane waves

Answer 3

straight waves

Question 4

speed of waves -

Answer 4

distance travelled by each wave every second through a medium
-speed of energy transfer

Question 5

wave speed formula

Answer 5

frequency x wavelength

Question 6

speed of sound formula

Answer 6

distance/time

Question 7

normal of surface

Answer 7

90 degrees to surface

Question 8

refraction

Answer 8

change of direction of wave when they cross a boundary between mediums

Question 9

Refraction: non zero angled wave to boundary

Answer 9

change speed + direction

Question 10

Refraction: normal incident ray

Answer 10

speed changes only

Question 11

wave front

Answer 11

line from crest to trough

Question 12

diff between refracted and incident waves

Answer 12

-same frequency
-diff speeds so diff wavelengths

Question 13

Refraction: more dense medium

Answer 13

-refracted ray will be towards normal (smaller angle )

Question 14

Refraction: less dense medium

Answer 14

-refracted ray will be away from normal (larger angle )

Question 15

Law of reflection

Answer 15

angle of incidence = angle of reflection

Question 16

partial reflection

Answer 16

-waves directed at a substance may be reflected and some may be transmitted/absorbed
-depends on surface/wavelength

Question 17

waves that are absorbed by waves

Answer 17

some waves are absorbed by substance
-heats surface = energy gain

Question 18

amplitude in absorption

Answer 18

as waves travel through
-amplitude decreases
-as more energy is absorbed

Question 19

transmission

Answer 19

-waves that aren’t absorbed are allowed to pass through

Question 20

reflection in a ripple tank

Answer 20

-plane waves are reflected from a straight barrier at same angle as incident waves
-speed/ wavelength won’t change

Question 21

does reflection of a wave alter speed or wavelength

Answer 21

no
-no change in medium
-reflected into original medium