current and charge

Question 1

define displacement (waves)

Answer 1

The distance from the equilibrium positions

Question 2

define amplitude

Answer 2

max displacement

Question 3

Define wavelength

Answer 3

The minimum distance between two points in phase on adjacent waves

Question 4

Define time period of oscillation

Answer 4

the time take to for a wave to complete one oscillation

Question 5

frequency definition

Answer 5

the number of wavelengths passing a point per unit time

Question 6

wave speed

Answer 6

the distance travelled by the wave per unit time

Question 7

wave equation

Answer 7

v=f x lamda

Question 8

define phase difference

Answer 8

the difference between displacement of particles on a wave

Question 9

what is the phase difference when two particles in phase

Answer 9

0 or 2pi radians

Question 10

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

Answer 10

pi radians

Question 11

When does reflection occur

Answer 11

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

Question 12

what is the law of reflection

Answer 12

angle of incidence + angle of reflection

Question 13

when does refraction occur

Answer 13

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

Question 14

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

Answer 14

slower

Question 15

What is diffraction?

Answer 15

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

Question 16

what is polarised?

Answer 16

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

Question 17

Intensity=

Answer 17

Power/Area

Question 18

You can polarised electromagnetic waves using polarisers

Answer 18

This means only waves with a certain orientation can pass through

Question 19

The refractive index

Answer 19

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

Question 20

What is the Snell’s law?

Answer 20

n1sin(x1)+n2sin(x2)

Question 21

Total internal reflection

Answer 21

theta is greater than the critical angle

Question 22

sin of the critical angle=

Answer 22

1/refractive index

Question 23

super position

Answer 23

when two waves of the same type passing through each other

Question 24

Define Coherence

Answer 24

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

Question 25

what does each of the symbols mean in

lamda= ax/D

Answer 25

a: slit separation, D: distance fro source to screen, x: separation between light and dark and screen

Question 26

What is node

Answer 26

a Point of 0 displacement, 0 intensity and 0 amplitude on a stationary wave

Question 27

What is an antinode

Answer 27

a Point of max displacement, max intensity and max amplitude on a stationary wave

Question 28

A stationary wave in a coloumn starts and stops when in a one end closed and a both ends open

Answer 28

One open: Starts in middle on one end and top on open

Both open: Starts and ends on edges of tube

Question 29

what does the symbols stand for in:

E=hc/lamda

Answer 29

Energy of photon= Planck’s constat x Frequency

Question 30

One electronvolt is

Answer 30

the energy transferred when an electron moves through a pd of one volt

Question 31

The photoelectric effects

Answer 31

When the electromagnetic radiation hits the surface of a metal causes electrons to be emitted

Question 32

Define work function ( circle with line)

Answer 32

The minimum energy required to free and electron from the surface of a metal

Question 33

what do the symbols mean of : hf= (circle line) + Ekmax

Answer 33

Energy of a photon= Work function + max KE of emmited electron

Question 34

What is used to diffract electrons

Answer 34

polycrystaline graphite