Question

applications of convections and radiation with explaination

ʟᴇᴀᴠɪɴɢ ʙʀᴀɪɴʟʏ ᴛᴀᴋᴇ ᴛʜᴇ ᴘᴏɪɴᴛꜱ



ꜱᴏʀʀʏ ᴍᴇʀɪ ꜱɪꜱ ᴊᴀɴᴀ ᴘᴀᴅᴇɢᴀ ​

Answer 1

Convection:

Hot air rising, cooling, and falling (convection currents)

An old-fashioned radiator (creates a convection cell in a room by emitting warm air at the top and drawing in cool air at the bottom).

Radiation:

Heat from the sun warming your face

Heat from a lightbulb

Heat from a fire

Heat from anything else which is warmer than its surroundings.

Answer 2

• Sea breeze

On a sunny day the land heats up more quickly than the sea because land absorbs heat faster than water. Hence, air over the land surface becomes more heated than air above the sea. So the hot air over the land being lighter moves up and the cooler air from the sea takes its place. Thus a cool and comforting breeze blows from the sea to the land. Therefore, it is called sea breeze.

• Land breeze

The situation during the night is opposite. The sun is not there to heat and the cooling process has started. The land gives up heat more quickly than water. Thus, the air above the sea remains warmer and moves up while its place is filled up by the cool breeze blowing from the land. Therefore, this breeze from land to sea is called the land breeze.