physics revision

Question 1

what are the two types of waves?

Answer 1

transverse and longitudional

Question 2

what are the electromagnetic waves?

Answer 2

radio waves, microwaves, infrared waves, visible waves, ultraviolet waves, x-rays and gamma rays

Question 3

conduction of heat is where vibrating particles pass on their kinetic energy to another particle. true or false?

Answer 3

true

Question 4

do hot air particles rise or fall?

Answer 4

rise

Question 5

what does an ammeter measure?

Answer 5

amps

Question 6

what does a volt meter measure?

Answer 6

volts

Question 7

how do you fix drafts in a house?

Answer 7

double glazed windows, loft insulation, carpets, cavity wall insulation, draft excluders.

Question 8

what is the most dense, solid, liquid or gas?

Answer 8

solid

Question 9

how do you find the density of a irregular stone?

Answer 9

drop in water and measure the rise.

Question 10

how does conduction work?

Answer 10

the particles in the solid vibrate and transfer the kinetic + heat energy towards the particles in the other solid.

Question 11

how does convection work?

Answer 11

the hot air rises and the cold air falls causing a convection current.

Question 12

what can travel through a vaccum?

Answer 12

radiation only.

Question 13

what does VIR stand for.

Answer 13

voltage, current and resistance.

Question 14

what do you need to do to find the resistance of a component.

Answer 14

know the current and the voltage, then divide the voltage by the current.

Question 15

Ω - what is this

Answer 15

an ohm.

Question 16

will the current turn towards the easiest route with the least resistance?

Answer 16

yes

Question 17

what is an LDR?

Answer 17

light dependant resistor.

Question 18

what is the power triangle.

Answer 18

power = energy transfered / time (or any version of this)

Question 19

what is watts

Answer 19

a unit of power

Question 20

what does an earth wire do?

Answer 20

keeps everything safe.

Question 21

is current the same or different in a series circuit?

Answer 21

same

Question 22

is current the same or different in a parallel circuit?

Answer 22

different

Question 23

what is in the national grid?

Answer 23

powerstation, step up transformer, pylons, step down transformer, home or buisness.

Question 24

what is the voltage of the parts of the national grid?

Answer 24

25000 powerstation, 400000 pylons, 230 home

Question 25

what is a kWh?

Answer 25

kilowatt hour.

Question 26

how do you calculate energy transfered?

Answer 26

power * time

Question 27

what are fuses used for?

Answer 27

if too much voltage goes through a fuse it melts as they have low melting points.

Question 28

what colours are the wires ina plug?

Answer 28

brown for live wire, green and yellow for earth wire and blue for neutral wire.

Question 29

define mcb.

Answer 29

miniature circuit breaker breaks a section of a circuit by seperating peices of metal and breaking the circuit.

Question 30

what is the earth wire for?

Answer 30

to protect apliances from having too much voltage flowing through.

Question 31

what does the angle of incidence entail?

Answer 31

most of the light gets reflected

Question 32

what is the critical angle?

Answer 32

the angle upon where the light refracts against the boundary line.

Question 33

what is total internal reflection?

Answer 33

where all light is reflected equally from the boundary.