Ch. 13 Lab 3 Radiation 2021
Ch. 13 Lab 3 Radiation 2021
Ch. 13 Lab 3 Radiation 2021
1. The Sun is millions of kilometers away. How can heat from the Sun get here?
2. If you look inside an electric stove or toaster oven, how can you tell whether it’s turned on?
Gizmo Warm-up
izmo, you can focus the light of a super-powerful flashlight upon
In the Radiation G
a kernel of popcorn and see what happens. The lens, which focuses the light, can
be moved to the left or right.
1. The Temperature slider controls the heat of the metal filament inside the light.
Scientists use the Kelvin scale to measure the temperature of very hot
objects. It is like the Celsius scale except 0 K (absolute zero) is the coldest
anything can ever be.
Slowly move the Temperature slider all the way to the right. What happens?
2. Slide the lens so the distance to the flashlight is 50 cm. Press Play ( ). What happens?
How long did it take in seconds?
1.9 seconds
3. Do you think the kernel will pop if you place cardboard in front of the no
flashlight?
4. Click Reset ( ). At the top of the Gizmo, next to Obstacle, select Cardboard. Press Play.
What happens? Nothing happened
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Get the Gizmo ready:
Activity A:
● Click Reset.
What does the ● Set Temperature to 1500 K.
popping? ● Slide the lens so it is 60 cm from the light.
● For Obstacle, select None.
Question: How does heat get from the flashlight’s metal filament to the kernel?
1. Observe: Press Play. How long does it take the kernel to pop? 88.2 seconds
2. Form hypothesis: Inside the light bulb is a very hot piece of metal, called the filament. It gives off light
because it is so hot. In addition, the glass bulb gets hot and heats the air.
How do you think heat gets from the filament to the kernel?
The radiation transfers the energy through the air to the kernel
3. Predict: Click Reset and select Cardboard. This blocks all light and some of the hot air. Based on your
hypothesis, how will this affect popping time? Explain.
The energy is not going directly to the kernel it has to go through the cardboard
5. Predict: Click Reset and select Red glass. This lets most of the light through but still blocks some
hot air. What do you think will happen? Explain.
7. Draw conclusions: When the popcorn kernel popped, was it because it was heated by light (radiation) or
hot air from the flashlight? Explain how you know this.
The energy will build up until it is to hot and then it will pop the kernel
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Get the Gizmo ready:
Activity B:
● Click Reset.
Out of sight ● Slide the lens so it is 70 cm from the light.
● Set the Temperature to 2000 K.
1. Observe: Select Blue glass. How does this affect the light that gets to the corn?
2. Conjecture: Will the corn pop when you start the simulation? Explain.
4. Draw conclusions: The filament radiates both visible light (orange in this case) and invisible light (infrared
light). Did the blue glass block infrared light? Explain how you can tell.
The blue light blocked the infrared light because after the glass it turned blue not the orange
5. Run Gizmo: Click Reset. Remove the glass. Click Play. When does the corn pop? 38.0
seconds
6. Analyze: Compare the popping times with and without the blue glass. Is most of the radiation given
off by the filament red or infrared? Explain.
7. Test: Click Reset. Select Cardboard and then click Fast Forward. Does the cardboard block infrared
light?
Explain. Yes because the kernel did not pop
8. Extend: Do you think the blue glass or the cardboard gets hotter in this experiment? Why?
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