Unit 2 Flashcards

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
What happens to the ray of light if the critical angle is exceeded
Total internal reflection is achieved
25
Define transmitted
When some of the wave passes across the barrier whilst the rest reflects
26
Define diffraction
Interaction between solid objects and waves
27
Refractive index=
Sini/sinr
28
What happens to the speed of a light ray when going from a more dense medium to a less dense medium
Slows down
29
What happens to The speed of a light ray when going from a more dense medium to a less dense medium
It speeds up
30
What does snells law say
That sini/sinr=a constant
31
Define refraction
Change of direction of a wave when it's speed changes
32
Define reflection
When a wave hits a barrier and changes direction
33
Refractive index (from medium 1 to medium 2)
V1/V2