As Waves

Question 1

What is the equation for the refractive index of light??

Answer 1

c\v = n

Question 2

What is maulus law? And the two sub laws

Answer 2

A= Ao Cos©
I proportional A^2

Maulus law
I=I^2 Cos^2©

Question 3

What is the equation of the Doppler effect including f, v and c

Answer 3

V/C = ∆f/f = ∆✓/✓

✓ is wavelength

Question 4

The equation of the ratio of Doppler effect?

Answer 4

Z= V/C

Question 5

What is C in the the Doppler effect?

Answer 5

The speed of the wave

Question 6

What is Snell’s law??

Answer 6

Sini / Sinr. = n

Question 7

Which direction does a wave bend if it slows down?

Answer 7

If it slows down, it goes towards the normal

Question 8

What is n, I’m terms of speed?

Answer 8

Speed 1 / speed 2 = n

Where 1 is the initial

Question 9

At what angle will light be internally retracted

Answer 9

At the critical angle

Question 10

What remains constant throughout retraction

Answer 10

The frequency

Question 11

What remains constant throughout retraction

Answer 11

Frequency

Question 12

When do you get construction path difference?

Answer 12

When the multiple of the wavelength is

n✓

Question 13

When do you get deconstructive path difference?

Answer 13

When the multiple is n/2 ✓

Question 14

To be coherent what must be the same?

Answer 14

They must have the same wavelength thus colour of lightt

Question 15

What is the principle of superposition?

Answer 15

States that when two waves meet at a point the resultant displacement at that point is equal to the sum of displacements of the individual waves.

Question 16

What is the difference between path and phase difference?

Answer 16

Path is the difference in distance- a Length

Phase is a a measurement in degrees or radians

Question 17

What is the refraction law?

Answer 17

n1 sin©1 = n2 sin©2

Question 18

The equation for critical angle?

Answer 18

Sin C = 1/n

Question 19

Properties of EM waves?

Answer 19

Can travel through a vacuum

Travel at C

Are transverse

Made up of electromagnetic and electrical

Question 20

What is frequency?

Answer 20

The number of wavelengths passing through a point per unit time

Question 21

Which direction does the energy travel in a longitudinal wave?

Answer 21

In the direction of motion

Question 22

What is diffraction?

Answer 22

Is the spreading of a wave when it passing through a narrow gap.

The SPEED, WAVELENGTH and FREQUENCY, do not change

There is significant diffraction when the width is similar to the wavelength of the wave

( why can be heard through doors)

Question 23

What is a in the YDS experiment and how would you measure it

Answer 23

The fringe separation, using a travelling microscope

Question 24

How did Young produce coherent light?

Answer 24

He either put a colour filter or he added a single slit before the double ones

Question 25

What is the other equation for YDS experiment?

Answer 25

d sin©=n✓

Question 26

Why does white light split up??

Answer 26

Because of sin© proportional to the wavelength So the bigger the angle the longer the wavelength

Question 27

What is the velocity of the wave equal?

Answer 27

V= √T/Ù. Ù= mass/ length

Question 28

What is the wavelength better two NODES?

Answer 28

1/2✓

Question 29

What is the wavelength of a Antinode and node?

Answer 29

1/4 ✓

Question 30

What does the fundamental frequency mean?

Answer 30

The lowest frequency of virbration per arrangement

Question 31

Is the length of the string is L, what's the length of the wavelength if you know the fundamental frequency?

Answer 31

2L

Question 32

What do all the lettes mean? d sin© = n✓

Answer 32

``` n= the order (0th is the middle) ✓= wavelength d = the distance between slits ```