Wave Properties

Question 1

What is the principle of superposition?

Answer 1

When 2/more waves (of the same type) occupy the same position in space then the resultant wave is found by the vector sum of the individual displacements of the waves at any point

wtf

Question 2

What’s constructive interference?
(must be same type of wave)

Answer 2

2 waves in-phase adding together ig?

Question 3

What’s destructive interference?
(must also be same type of wave)

Answer 3

2 waves out-of-phase adding together ig?

Question 4

What’s total destructive interference?

Answer 4

Well after the 2 out-of-phase waves add, the resultant wave is zero aka cancellation

Question 5

Honestly the hard part talking bout here is just the stationary wave type shits,
I’d be perhaps good talking bout them slits n stuff

Answer 5

U right

Question 6

What are the 2 things known in a stationary wave?

Answer 6

1. Nodes
2. Antinodes

Question 7

Explain nodes

Answer 7

Places along wave w/ zero displacement
Destructive interference

Question 8

Explain antinodes

Answer 8

Places between nodes that oscillate & suffer maximum displacement

• range of (maximum) constructive and destructive interference occur here

Question 9

Formula for distance between adjacent nodes/adjacent antinodes?

Answer 9

Inter-nodal spacing is λ/2

Question 10

Look in phone for difference between stationary wave and progressive wave

Answer 10

Okay

Question 11

and also look in phone for them damn string, closed and open pipe harmonic type shi

Answer 11

Yup…

Question 12

What is diffraction of a wave?

Answer 12

The spreading out of a wave’s energy around obstacles and through gaps

Question 13

For a diffraction thru gap, what happens when gap width decreases?

Answer 13

If gap width decreases, amount of diffraction (angle of spread) increases

Question 14

When does maximum diffraction occur?

Answer 14

Gap width equal/slightly smaller than λ

Question 15

Explain coherent sources during 2 source interference

Answer 15

• Coherent when they produces waves of same freq
• Same amplitude and maintain constant phase difference

Question 16

Explain incoherent wave sources during 2 source interference

Answer 16

• 2 sources of waves having different frequencies
  -Will have phases constantly changing
• Therefore pattern produces constantly changing

Question 17

2 examples of incoherent wave sources?

Answer 17

• Sunlight
• Light bulbs

Question 18

Formula for interference fringe separation formula?

Answer 18

λ = (a△y)/D

Question 19

Explain each symbol within interference fringe separation formula
(all must be in m units)

λ = (a△y)/D

Answer 19

λ - wavelength (m)
a - source separation (m)
D - distance from source (m)
△y - fringe separation (m)

Question 20

In a double slit experiment, explain the bright fringes seen

Answer 20

• Constructive intereference
• Between 2 beams coming from both slits
• Must be arriving in-phase

Question 21

In a double slit experiment, explain the dark fringes seen

Answer 21

• Destructive interference
• Between 2 beams coming from both slits
• Must be arriving out-of-phase

Question 22

How to make double slit method more accurate?

Answer 22

Add more slits….

Question 23

3 advantages of using diffraction grating?

Answer 23

1. More light can pass thru = fringes r brighter
2. Fringes more well-defined, better cancellation either side of centre of fringe
3. Fringes more spread out due to much smaller slit separation

Question 24

What is meant by monochromatic light?

Answer 24

single-wavelength light

Question 25

What is the formula for diffraction grating?

Answer 25

nλ = dsinθ

Question 26

Explain each symbol within formula of diffraction grating (units gotta be m mostly) nλ = dsinθ

Answer 26

n - order number λ - wavelength (m) d - slit separation (m) θ - angular position of order from centre (degrees)

Question 27

Go do some questions, idk if i can, can i? Am cooked

Answer 27

He's cooked