4 Fig 5.1 shows two identical metal cans, open at the top, used in an experiment on thermal
energy. The outside of can A is polished and the outside of can B is painted black
polished
Surface
black
surface
can A
can B
Fig. 5.1
(a) The cans are heated to the same temperature. Predict and explain the relative rates of
loss of thermal energy by infra-red radiation from the two cans
Canal
le
kababawas dama amor en la conclusion is an amal sepel like
and where alla madre contando kando
les mehr kase
12]
(b) (i) A student is provided with the two cans, a supply of hot water and two thermometers.
Describe the experiment he should carry out to test your answer to (a)

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.

moisture is lackin, and organic acids are scarce.