Unit 2 Flashcards

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0
Q

Wavelength=

A

2L/n

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1
Q

Wave speed

A

Frequency . Wavelength

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2
Q

Frequency=

A

1/T

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3
Q

Transverse waves propagate

A

Up and down

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4
Q

Longitudinal waves propogate

A

To and fro

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5
Q

At what do transverse waves occur to their direction

A

At right angles

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6
Q

What are longitudinal waves to the direction

A

Parallel

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7
Q

Define amplitude

A

Max displacement from the equilibrium position

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8
Q

Define progressive waves

A

Waves that propagate/are in motion

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9
Q

Define stationary waves

A

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

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10
Q

An example of a stationary wave

A

Plucking guitar strings

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11
Q

What is the amplitude at a node

A

Zero

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12
Q

What is the amplitude at an antinode

A

Maximum

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13
Q

Define superposition

A

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

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14
Q

What are waves that oscillate one wavelength apart

A

In phase

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15
Q

What are waves that oscillate 1/2 a wavelength apart

A

In anti phase

16
Q

Draw a phase change of 180 degrees

A

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

17
Q

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

A

It will reflect with a phase difference of 180degrees

18
Q

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

A

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

19
Q

Define what is meant by decay in terms of waves

A

Rate that amplitude decreases

20
Q

What does the amount of diffraction depend on

A

The size of the gap and wavelength

21
Q

How is max diffraction achieved

A

When the size of the gap equals the wavelength

22
Q

Define total internal reflection

A

When the angle of reflection exceeds the critical angle

23
Q

Define the critical angle

A

Angle of incidence when the reflected angle is 90degrees

24
Q

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

A

Total internal reflection is achieved

25
Q

Define transmitted

A

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

26
Q

Define diffraction

A

Interaction between solid objects and waves

27
Q

Refractive index=

A

Sini/sinr

28
Q

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

A

Slows down

29
Q

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

A

It speeds up

30
Q

What does snells law say

A

That sini/sinr=a constant

31
Q

Define refraction

A

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

32
Q

Define reflection

A

When a wave hits a barrier and changes direction

33
Q

Refractive index (from medium 1 to medium 2)

A

V1/V2