current and charge Flashcards

(34 cards)

1
Q

define displacement (waves)

A

The distance from the equilibrium positions

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2
Q

define amplitude

A

max displacement

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3
Q

Define wavelength

A

The minimum distance between two points in phase on adjacent waves

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4
Q

Define time period of oscillation

A

the time take to for a wave to complete one oscillation

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5
Q

frequency definition

A

the number of wavelengths passing a point per unit time

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6
Q

wave speed

A

the distance travelled by the wave per unit time

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7
Q

wave equation

A

v=f x lamda

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8
Q

define phase difference

A

the difference between displacement of particles on a wave

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9
Q

what is the phase difference when two particles in phase

A

0 or 2pi radians

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10
Q

what is the phase difference when two particles in anti-phase

A

pi radians

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11
Q

When does reflection occur

A

reflection occurs when a wave changes direction at a boundary between two different media

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12
Q

what is the law of reflection

A

angle of incidence + angle of reflection

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13
Q

when does refraction occur

A

when a wave changes direction as it changes speed form one media to another

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14
Q

If water is shallower the speed of the waves are ____.

A

slower

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15
Q

What is diffraction?

A

when waves pass through a gap or round an obstacle and spread out

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16
Q

what is polarised?

A

When a wave’s vibration is confined to one plane of oscillation

17
Q

Intensity=

18
Q

You can polarised electromagnetic waves using polarisers

A

This means only waves with a certain orientation can pass through

19
Q

The refractive index

A

speed of light in vacuum/ speed or light in a material

20
Q

What is the Snell’s law?

A

n1sin(x1)+n2sin(x2)

21
Q

Total internal reflection

A

theta is greater than the critical angle

22
Q

sin of the critical angle=

A

1/refractive index

23
Q

super position

A

when two waves of the same type passing through each other

24
Q

Define Coherence

A

Waves emitted from two sourcing having constant phase difference and the same frequency.

25
what does each of the symbols mean in | lamda= ax/D
a: slit separation, D: distance fro source to screen, x: separation between light and dark and screen
26
What is node
a Point of 0 displacement, 0 intensity and 0 amplitude on a stationary wave
27
What is an antinode
a Point of max displacement, max intensity and max amplitude on a stationary wave
28
A stationary wave in a coloumn starts and stops when in a one end closed and a both ends open
One open: Starts in middle on one end and top on open | Both open: Starts and ends on edges of tube
29
what does the symbols stand for in: | E=hc/lamda
Energy of photon= Planck's constat x Frequency
30
One electronvolt is
the energy transferred when an electron moves through a pd of one volt
31
The photoelectric effects
When the electromagnetic radiation hits the surface of a metal causes electrons to be emitted
32
Define work function ( circle with line)
The minimum energy required to free and electron from the surface of a metal
33
what do the symbols mean of : hf= (circle line) + Ekmax
Energy of a photon= Work function + max KE of emmited electron
34
What is used to diffract electrons
polycrystaline graphite