True or false? Heat transfer?

True or false:





i) Heat radiation is sometimes called infrared radiation.


ii) Conduction involves the transfer of energy between moving particles.


iii) Hot objects do not absorb radiation.


iv) Convection always involves a moving liquid or gas.


v) Cold objects do not emit radiation.





If any of these are false, why?





Thankss. xTrue or false? Heat transfer?
i) Heat radiation is sometimes called infrared radiation - T.


ii) Conduction involves the transfer of energy between moving particles.


- F - not quite true - it involves the transfer by vibration of molecules - they do not move from their position


iii) Hot objects do not absorb radiation. -F not quite true. It depends on how hot is ';hot';! - heat is transferred from a hot object to a cooler one. But the hot object may be next to a hotter one


iv) Convection always involves a moving liquid or gas. - T


v) Cold objects do not emit radiation. -F.not quite true. define how cold is ';cold';?


Your hand may feel cold but it still radiates heat energy.


A bag of frozen peas taken to the Antarctic will be warmer than its surroundings so will radiate heat. True or false? Heat transfer?
i pretty sure this one is true


ii i would say this one is false conduction is the transfer of heat between two objects that are touching


iii i would say false but that's just a guess


iv defiantly true


v i have no idea about this one but i would say false because cold objects is a vast category but i don't know the actual reason
Let's start with the understanding that heat transfer is relative as is radiation. Hot objects will absorb radiated energy from hotter objects and cold objects will emit radiation (maybe not much but they will emit something).





In iv I suppose they expect you to say ';True';, but ';always'; answers are often problematic since convection might involve plasma (neither a liquid nor a gas).





-Fred