Lesson 8: OpenSciEd 6.2 Thermal Energy

What is the light that is transmitted through the cup?

• Light that passes through the cup

• Light that is absorbed by the cup

• Light that is emitted by the lamp

• Light that gets reflected off the cup’s surface

What is an important question for understanding light’s effect on water temperature?

• Where does the rest of the light go if it doesn’t transmit or reflect?

• How much water can each cup hold?

• What is the material composition of each cup?

• How long does a 100-W lightbulb last?

How should the sensor be held to measure reflected light?

• Align the sensor with the center line, facing the cup and holding it behind the dash.

• Place the sensor horizontally inside the cup.

How do the surfaces of different cups impact the temperature change of the water inside when exposed to light?

• Clear cups allow more light to pass through, warming the water more.

• All cup surfaces affect the temperature change the same way.

• Opaque cups warm water more than clear cups.

• Foil-wrapped cups cool the water instead of warming it.

What might you infer about the effect of the dark setting on the water temperature inside the cups?

• The water temperature would change less in a dark setting compared to a light setting.

• The water temperature would change more in a dark setting compared to a light setting.

• The water temperature would be the same in both dark and light settings.

• The water would boil in the dark setting.

Why is it important to measure the initial temperature of the water in each cup during the experiment?

• To determine the temperature change caused by light exposure.

• To check if the thermometers are working properly.

• To record how long it takes to boil the water.

• To ensure all cups have the same amount of water.

What can you conclude about the relationship between the amount of transmitted light and the water temperature in the cup?

• More transmitted light increases the water temperature more.

• Less transmitted light causes the water temperature to increase more.

• There is no relationship between transmitted light and water temperature.

• Transmitted light causes the water temperature to decrease.

What does the presence of reflected light indicate about the surface of the cups used in the experiment?

• The cups have materials that bounce back light.

• The cups are transparent.

• The cups absorb all the light.

• The cups are completely opaque.

What could be the reason why the water in the foil-wrapped cup might have a different temperature change compared to the clear plastic cup?

• Foil reflects light, preventing it from warming the water efficiently.

• Foil absorbs more light than clear plastic.

• Foil reflects more light away from the water.

• Foil transmits more light to the water.

If the white-painted cup reflects more light than the black-painted cup, what impact does this have on the water temperature in these cups?

• The water temperature in the black cup will increase more than in the white cup.

• The water temperature in the white cup will increase more than the black cup.

• Both cups will have the same temperature increase.

• The water in the white cup will decrease in temperature.