Transfer of Heat

Name three modes of heat transfer.

A bright shining surface is a _____ radiator of heat.

We wear dark coloured clothes in summer.

We wear light or white coloured clothes in summer. Give reason.

One model of a well-known brand of computer does not use a fan to keep the electronic circuits inside it cool, unlike other PCs. A student noticed  that the ventilation (air) slots on most other PCs are positioned on the side, but the slots are on the top and bottom surfaces of this computer. The  designer has applied physics to the problem of keeping the computer cool. Explain why the new computer does not need a fan. 

The diagrams below show a physics demonstration about thermal conduction.

A cylinder is made from a piece of brass fitted to a piece of wood. A piece of paper is glued around the middle. The paper is then heated over a Bunsen burner flame. After a while one end of the paper is noticeably more burnt than the other. Explain why this happens. 

Transfer of heat occurs in different modes. Explain different modes of heat transfer with suitable examples.

Can convection be used to transfer heat from the Sun? Explain. What are the main differences of radiation from other two modes?

Explain different modes of heat transfer such as conduction, convection and radiation.

Explain different modes of heat transfer with suitable examples.

Deserts have very hot days and equally cold nights. Give the reasons for it.

What is convection current? Give few examples of convection current.

What do you mean by thermal radiation, and what is its importance? Thermal radiation is transferred as an electromagnetic wave. Do you agree with the statement? Describe the factors affecting the rate of radiation.

What you mean by thermal conduction? Explain how thermal conduction takes place in metals by taking a metal rod as an example. Explain, why, during summers, a metal feels hotter than a plastic kept at the same temperature.

Explain how thermal conduction takes place in solids by taking a metal rod as an example. What you mean by thermal conductors and insulators? List the uses of thermal conductors and insulators in daily life.

Describe the three modes of transfer of heat by giving their applications in daily life.

What are some examples of convection currents in Daily Life

 A finned tube hot water radiator with a fan blowing air over it is kept in rooms during winter. The major portion of the heat transfer from the radiation is due to

Hot air always rises up.

Why can't heat energy get from the Sun to the Earth by conduction?