Infrared Radiation- Describe infrared radiation
- Investigate how the colour and texture of a surface affects emission and absorption of infrared radiation. - Investigate how temperature of a substance affects the rate of loss of infrared radiation OVER HERE - REMEMBER THIS INFRARED RADIATION - It can be REFLECTED or ABSORBED - It can TRAVEL through a vacuum LETS GET EXPERIMENTAL It's quite hard to actually experiment with infrared radiation because we humans can't see infrared waves. However, being the race that wants to test on practically EVERYTHING we have a way in which we can test these poor waves too. We both know (or should by now as it is just above this section) that infrared can be REFLECTED or ABSORBED. Equipment: Black flask, stopwatch, silver flask, 500ml hot water and thermometer. 1. Put an equal amount of hot water in each flask at the same time. Make sure you have 2 other friends (well they would try and burn you if they were your enemies). One can put fill the other flask and the other can be in charge of starting the time. 2. After filling the hot water in the two different flasks pop in a thermometer in both of them. As soon as you put in the thermometer, alert the timekeeper-friend-person. 3. Record the temperature on a results table. Record the temperature for every minute for 10 minutes. AFTER - clear up the place and try not to burn your house. Also make a prediction beforehand to see if you're psychic! OR, you can just read the section below on what should and does happen. Saves a lot of time but if you're like me who spends their spare time writing about GCSE physics THEN WHY NOT? In theory, the silver flask should have lost the least amount of heat in 10 minutes because silver reflects the heat transferred by infrared radiation. This means that heat energy within the flask reflects and never travels out of the flask. However, the black flask should lose the most amount of heat because it absorbs the heat. This means heat will be absorbed then escape into the atmosphere. |
Infrared radiation one way in which heat can be transferred between objects. Infrared radiation occurs in pretty much anything. The great thing about infrared radiation is that is can travel through a vacuum. This means that it doesn't NEED particles to transfer heat. The amazingly artistic diagram below shows infrared radiation travelling through a vacuum.
So this video is a great way to clear up what you don't understand. However, some things mentioned in the video we haven't discussed. Learn what you need to from your specification.
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