transfer of thermal energy

Question 1

what is thermal energy

Answer 1

thermal energy flows from a region of higher temperature to a region of lower temperature. the transfer of thermal energy can occur in three different way (CONDUCTION CONVECTION RADIATION)

Question 2

what is conduction

Answer 2

conduction is the process by which thermal energy is transmitted through a medium from one particle to another place

Question 3

what is a medium

Answer 3

smt like solid liquid and gasXD

Question 4

how does conduction work

Answer 4

when one end of the rod is heated the atom there gain energy and vibrate the atom collide with the neighbour atom until the end

Question 5

what does solid transfer faster than other states (conduction)

Answer 5

as solid is molecules are closer to each other thus the kinetic energy can be pass through more easily

Question 6

eg of good conductor of heat

Answer 6

copper iron

Question 7

wat is another word for poor conductor

Answer 7

insulators

Question 8

how can insulator help in our normal life

Answer 8

insulator are poor conductor of heat so they can achieve of reducing the conduction of thermal energy

Question 9

why does birld puff up in cold weather ?

Answer 9

as feather can trap air,and air is a poor conductor of heat so it help them to reduce heat lost in cold weather

Question 10

what is convection

Answer 10

convection is the process by which thermal energy is tramited from one place to another by the movement of heat and gas

Question 11

why is air conditional put up in high places

Answer 11

as hot air rise cold air sinks by putting air-conditional high up helps to creat a convection current which allow the room to stay cool

Question 12

sea and land breeze

Answer 12

during the day the land heats ip much faster than sea due to efficient conduction in the ground (liquid bad conductor compare to solid !!!) convection also cannot be taken place as only the SURFACE of the water is heated and rise and come back that is sea BREEZEEEE

Question 13

conduction is only for metal vs non metal

Radiator/absorber is for coloured eg black vs white or shinyyyyyyyyy!!!!

Answer 13

_ jia you!!!

Question 14

radiation

Answer 14

radiation is the process by which thermal energy is transferred by electromagnetic wave

Question 15

the rate of energy trasnsfer by radiation is affected by???

Answer 15

surface temperature surface COLOUR and TEXTURE and surface area

Question 16

what is infra red radiation

Answer 16

IMP ASK CHERRR

Question 17

vacuum flask (the plastic cap)

Answer 17

the plastic cap prevent convection(hot air rise and cold air sinks ) and evaporation

Question 18

vacuum flask(the wall between the outercase )

Answer 18

prevent therma energy tansfer through conduction and convection(radiator s about the colourrrrrrrrr)

Question 19

vacuum flask (plastic stand under the flask)

Answer 19

reduce the rate of thermal energy transmitted by conduction through the tin glass walls of the flask

Question 20

vacuum flask sliver surface on the inside and outside

Answer 20

they will reflected infra red radiation from hot fluids back to the flask (inner)
infra red radiation from external surrounding away from the flask (outer)

Question 21

why does metal transmit heat faster then non metal

Answer 21

free electron in metal when heated the free electron gain energy and move faster those electron are free to travel in the space between molecules and Collier with other molecules hence metal is faster than non metal

Question 22

why does liquid take up space of the container

Answer 22

liquid molecules are closely packed together in an non regular arrangement while solid molecules are closly packed together in a regular arrangement liquid molesclues also slide pass each other while solid moleclues vibrate at its own space the intermolescules attraction in liquid are strong but not as strong as solid