Heat Sht_2
1. A white washed wall on a house absorbs 40% of heat radiation from the Sun and reflects 60% back into the atmosphere. Another wall on the same house made of red brick absorbs 70% and reflects back 30%. Tar, which is used for resurfacing roads, reflects 10% and absorbs 90%.
a) In your jotter, construct a table to show this information. Remember to include headings.
b) If the Earth absorbs 85% of heat radiation from the Sun, how much does it reflect back into space?
c) List the surfaces red brick wall, white washed wall, tar and Earth in order of how much they absorb heat.
d) On sunny days tar on the roads becomes soft. Explain why this happens.
2. Sohail carried out an experiment to find out which type of surface absorbed heat best. He put some black and silver paper on the back of his hands and held them under a lamp as shown opposite.
a) Which hand becomes hottest first?
b) Why is it a fair test?
c) Copy and complete the following sentences.
