Waves

Question 1

what is a transverse wave?

Answer 1

the oscillations of particles are perpendicular to the direction of the energy transfer

Question 2

what is a longitudinal wave?

Answer 2

the oscillations of particles are parallel to the direction of the energy transfer

Question 3

what is snells law?

Answer 3

n1sinθ1 = n2sinθ2

Question 4

what is the speed of light?

Answer 4

299792458ms-1

Question 5

what happens when the angle of incidence is less than the critical angle?

Answer 5

ray is mostly refracted

Question 6

what happens when the angle of incidence is equal to the critical angle?

Answer 6

ray emerges from the edge of the block

Question 7

what happens when the angle of incidence is greater to the critical angle?

Answer 7

ray is totally internally reflected

Question 8

how do you work out the refractive index of a material?

Answer 8

n = sol in vacuum/sol in medium

Question 9

how to work out critical angle?

Answer 9

sinC = 1/n

Question 10

what are the two conditions for tir?

Answer 10

1) light must be travelling from higher to lower refractive index
2) angle which light strikes must be greater than critical angle

Question 11

what is a progressive wave?

Answer 11

waves that move outwards from their source

Question 12

what is frequency?

Answer 12

the number of waves passing a fixed point in one second

Question 13

what is a time period?

Answer 13

time taken for one wave cycle to pass a fixed point

Question 14

what is a wavelength?

Answer 14

the least distance between two points on wave that are exactly in phase

Question 15

what is amplitude?

Answer 15

the maximum displacement of a particle from it position of equilibrium

Question 16

how to work out frequency?

Answer 16

f =1/time period

Question 17

how many radians in a circle?

Answer 17

2 radians

Question 18

what is phase difference?

Answer 18

the difference between the phase of two points on a wave

Question 19

what is polarisation?

Answer 19

the process of restricting waves to one plane perpendicular to the direction of energy transfer

Question 20

what does a polarising filter do?

Answer 20

transmits waves that are parallel to its alignment axis and absorbs any other orientations

Question 21

what are harmonics?

Answer 21

series of specific frequencies that are integer multiples of the fundamental frequency

Question 22

how to work out fundamental frequency?

Answer 22

fn = nf0

Question 23

what is an antinode?

Answer 23

the highest point of a stationary wave

Question 24

what is a node?

Answer 24

the point at which the stationary wave doesnt move

Question 25

when is a point moving at fastest velocity on a stationary wave?

Answer 25

the antinode

Question 26

what is the length of one pod?

Answer 26

1/2 wavelength

Question 27

what is the energy transfer of a stationary wave?

Answer 27

no net energy transfer

Question 28

what is the wavelength of a stationary wave?

Answer 28

double the distance of two anti/nodes

Question 29

what is the phase difference of stationary waves?

Answer 29

in phase with points in the same pod out of phase with points in the other pod

Question 30

what is the amplitude of stationary waves?

Answer 30

different anywhere except maximum at antinode