Unit 2

Question 0

Wavelength=

Answer 0

2L/n

Question 1

Wave speed

Answer 1

Frequency . Wavelength

Question 2

Frequency=

Answer 2

1/T

Question 3

Transverse waves propagate

Answer 3

Up and down

Question 4

Longitudinal waves propogate

Answer 4

To and fro

Question 5

At what do transverse waves occur to their direction

Answer 5

At right angles

Question 6

What are longitudinal waves to the direction

Answer 6

Parallel

Question 7

Define amplitude

Answer 7

Max displacement from the equilibrium position

Question 8

Define progressive waves

Answer 8

Waves that propagate/are in motion

Question 9

Define stationary waves

Answer 9

Positions of peaks and troughs aren’t moving/are stationary

Question 10

An example of a stationary wave

Answer 10

Plucking guitar strings

Question 11

What is the amplitude at a node

Answer 11

Zero

Question 12

What is the amplitude at an antinode

Answer 12

Maximum

Question 13

Define superposition

Answer 13

When 2+ waves meet and their total displacement at any point is the sum of the displacements that each individual wave would cause at that point

Question 14

What are waves that oscillate one wavelength apart

Answer 14

In phase

Question 15

What are waves that oscillate 1/2 a wavelength apart

Answer 15

In anti phase

Question 16

Draw a phase change of 180 degrees

Answer 16

Blimp travelling towards a wall then it reflects and is opposite on the way back from the wall (see notes if need be)

Question 17

What would happen if a light ray travels from a less dense medium to a more dense medium? And with what phase difference?

Answer 17

It will reflect with a phase difference of 180degrees

Question 18

What would happen if a light ray was travelling from a more dense medium to a less dense medium? And with what phase change?

Answer 18

It will not leave the more dense medium, just reflect internally with no phase change

Question 19

Define what is meant by decay in terms of waves

Answer 19

Rate that amplitude decreases

Question 20

What does the amount of diffraction depend on

Answer 20

The size of the gap and wavelength

Question 21

How is max diffraction achieved

Answer 21

When the size of the gap equals the wavelength

Question 22

Define total internal reflection

Answer 22

When the angle of reflection exceeds the critical angle

Question 23

Define the critical angle

Answer 23

Angle of incidence when the reflected angle is 90degrees

Question 24

What happens to the ray of light if the critical angle is exceeded

Answer 24

Total internal reflection is achieved

Question 25

Define transmitted

Answer 25

When some of the wave passes across the barrier whilst the rest reflects

Question 26

Define diffraction

Answer 26

Interaction between solid objects and waves

Question 27

Refractive index=

Answer 27

Sini/sinr

Question 28

What happens to the speed of a light ray when going from a more dense medium to a less dense medium

Answer 28

Slows down

Question 29

What happens to The speed of a light ray when going from a more dense medium to a less dense medium

Answer 29

It speeds up

Question 30

What does snells law say

Answer 30

That sini/sinr=a constant

Question 31

Define refraction

Answer 31

Change of direction of a wave when it’s speed changes

Question 32

Define reflection

Answer 32

When a wave hits a barrier and changes direction

Question 33

Refractive index (from medium 1 to medium 2)

Answer 33

V1/V2