Infrared Radiation in Energy Transfer Experiments
Energy Transfer:
Infrared Radiation
Do now activity:
Describe the difference
between the processes of conduction and
convection.
GOOD PROGRESS:
•
Describe some sources of infrared radiation
•
Explain how energy is transferred by radiation
OUTSTANDING PROGRESS:
•
Compare thermal energy lost through different
surfaces
Progress indicators
Word Consciousness
•
Emit – To give out
What is infrared radiation?
Task:
Watch the video and try to come up
with a definition for ‘infrared radiation’
https://www.youtube.com/watch?v=JcWOyaqNo8I
Infrared radiation is the transfer of
heat
energy
by means of
infrared electromagnetic
waves
. All objects take up energy by
infrared
radiation
and also gives out energy by
infrared radiation
. Different objects give out
different amounts of radiation depending on
their
temperature
.
Leslie’s cube
4 surfaces:
•
Shiny white
•
Shiny black
•
Dull black
•
Dull white
Different
surfaces
emit
different levels
of
infrared
radiation
What’s the difference? Which emits more
and which emits less infrared radiation?
Infrared radiation
Task:
Write a prediction in your books
Equipment
:
•
400ml beaker
•
Black tin
•
Silver tin
•
Cork mat
•
Hardboard lid
•
Thermometers
Method:
1.
Pour 400ml of boiling water into the plastic beaker.
2.
Pour 200ml of the 400ml into the black tin and the remaining 200ml into
the silver tin.
3.
Place the tins onto a cork mat and place a thermometer into each tin.
4.
Take the starting temperature of the water in each tin and record in the
table at time = 0 minutes.
5.
Start the stopwatch and take the temperature of the water in each tine
every minute for 15 minutes
.
Record your results in the table below:
Watch the video to see
the practical
Black
tin
Silver
tin
https://www.youtube.com
/watch?v=LFwio38EK9s
100
97
96
95
94
93
92
91
90
89
88
87
87
86
86
100
96
95
92
90
88
85
81
78
74
70
68
66
64
62
Time in minutes
Temperature in
o
C
y
x
Complete the following the tasks:
1.
Draw a graph to show your results
2.
Which tin showed the greatest change in
temperature in the 15 minutes?
3.
Explain your results
4.
How could you improve your experiment?
5.
What else could you study?
Analyse your Results
Absorbing & reflecting infrared
You can feel that you have
absorbed infrared radiation
from the Sun, as you skin warms
up and you get hotter.
Objects that are made from
darker materials absorb more
infrared radiation than objects
made from lighter coloured
materials.
Foil is has shiny surface, this
material can be used to
reflect infrared radiation.
When you wrap hot food in
foil, you are reflecting the
heat of the food back
towards the food in order for
it stay warm.
_____ objects transfer heat by
radiation
in
the form of
infra-red
_____
. Radiation is the
only way heat can be transferred through a
______.
_____
surfaces absorb radiation
quickly, but ______ surfaces ________
radiation.
Infrared Radiation
Dark Waves Reflect Hot Shiny Vacuum
Task:
Copy and complete the following sentences using the key
words below:
Hot
objects transfer heat by
radiation
in the form of
infra-red
waves
Radiation is the only way heat can be
transferred through a
vacuum
.
Dark
surfaces absorb radiation quickly, but
shiny
surfaces
reflect
radiation.
Self-assessment:
Plenary
~ Pick a task:
Summarise
what you
have learnt
today in 3
sentences
Write a definition for
the following key words:
a) radiation
b) conduction
c) convection
d) reflection
e) vacuum
Explore the difference between conduction and convection, sources of infrared radiation, and how energy is transferred through radiation. Investigate how different surfaces emit varying levels of infrared radiation using a practical experiment with black and silver tins. Analyze and interpret results to draw conclusions about thermal energy transfer. Additionally, learn about absorbing and reflecting infrared radiation using materials like shiny foil.
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Presentation Transcript
Energy Transfer: Infrared Radiation Do now activity: Describe the difference between the processes of conduction and convection.
Progress indicators GOOD PROGRESS: Describe some sources of infrared radiation Explain how energy is transferred by radiation OUTSTANDING PROGRESS: Compare thermal energy lost through different surfaces
Word Consciousness Emit To give out
What is infrared radiation? Task: Watch the video and try to come up with a definition for infrared radiation https://www.youtube.com/watch?v=JcWOyaqNo8I Infrared radiation is the transfer of heat energy by means of infrared electromagnetic waves. All objects take up energy by infrared radiation and also gives out energy by infrared radiation. Different objects give out different amounts of radiation depending on their temperature.
Infrared radiation Different surfaces emit different levels of infrared radiation 4 surfaces: Shiny white Shiny black Dull black Dull white Leslie s cube What s the difference? Which emits more and which emits less infrared radiation? Task: Write a prediction in your books
Watch the video to see the practical https://www.youtube.com /watch?v=LFwio38EK9s Equipment: 400ml beaker Black tin Silver tin Cork mat Hardboard lid Thermometers Method: 1. 2. Pour 400ml of boiling water into the plastic beaker. Pour 200ml of the 400ml into the black tin and the remaining 200ml into the silver tin. Place the tins onto a cork mat and place a thermometer into each tin. Take the starting temperature of the water in each tin and record in the table at time = 0 minutes. Start the stopwatch and take the temperature of the water in each tine every minute for 15 minutes. Record your results in the table below: 3. 4. 5. Black tin 96 90 89 86 91 86 95 94 92 87 93 97 87 100 88 Silver tin 95 78 74 64 81 62 92 90 85 66 88 96 68 100 70
Analyse your Results y Complete the following the tasks: 1. Draw a graph to show your results 2. Which tin showed the greatest change in temperature in the 15 minutes? 3. Explain your results 4. How could you improve your experiment? 5. What else could you study? Temperature in oC x Time in minutes
Absorbing & reflecting infrared Foil is has shiny surface, this material can be used to reflect infrared radiation. You can feel that you have absorbed infrared radiation from the Sun, as you skin warms up and you get hotter. When you wrap hot food in foil, you are reflecting the heat of the food back towards the food in order for it stay warm. Objects that are made from darker materials absorb more infrared radiation than objects made from lighter coloured materials.
Infrared Radiation Task: Copy and complete the following sentences using the key words below: Dark Waves Reflect Hot Shiny Vacuum _____ objects transfer heat by radiation in the form of infra-red _____. Radiation is the only way heat can be transferred through a ______. _____ surfaces absorb radiation quickly, but ______ surfaces ________ radiation.
Self-assessment: Hot objects transfer heat by radiation in the form of infra-red waves Radiation is the only way heat can be transferred through a vacuum. Dark surfaces absorb radiation quickly, but shiny surfaces reflect radiation.
Plenary ~ Pick a task: Write a definition for the following key words: Summarise what you have learnt today in 3 sentences a) radiation b) conduction c) convection d) reflection e) vacuum
