Directions: Use the information provided and your knowledge of Physical Science to answer the following questions. Show all work where necessary.
Directions: Use the information provided and your knowledge of Physical Science to answer the following questions. Show all work where necessary.
Diagram 1.
Source:
https://www.youtube.com/watch?v=R8yzaznukac
Sunlight can warm objects, but some setups heat much faster than others. The challenge is to design a device that maximizes thermal energy transfer from sunlight to a target (like a cup of water or a marshmallow “snack warmer”).
Thermal energy transfers whenever energy moves from one place to another because of a temperature difference. In a solar oven, the energy source is the Sun. The goal is to transfer as much solar energy as possible into the inside of the oven and into the object being heated.
A solar oven mainly uses radiation, which is energy transferred by electromagnetic waves. Sunlight travels through space as radiation and can be absorbed by surfaces on Earth. Dark, dull surfaces absorb more radiant energy than shiny, reflective surfaces. That is why a black interior is often used inside a solar oven: it absorbs solar radiation and warms up. The warm interior can then transfer thermal energy to the air and to the food or water inside by conduction (direct contact) and convection (moving warm air).
Design features can increase heating by:
Reflectors (like aluminum foil) that bounce more sunlight into the oven.
A clear plastic window that reduces convection by trapping warm air in.
Better sealing to prevent warm air from escaping.
Positioning and angle of reflectors to increase incoming radiation.
Students can test the performance of their solar ovens by measuring the temperature of water (or air inside the oven) over time using the same starting temperature and the same location outdoors. If a design maximizes thermal energy transfer, the temperature rises faster and reaches a higher value.
In this example, students use ideas about radiation, absorption, reflection, and insulation to improve their solar oven design, then evaluate performance using temperature–time data.
Graph of Information - Figure 1.
Graph of Information - Figure 2.
Using the reading, explain why a solar oven heats faster than an uncovered container placed in the same sunlight.
Using Figure 1, describe how the temperature of the solar oven changes compared to the control setup over time.
Which statement best describes the pattern shown in Figure 2?
Which conclusion is best supported by Diagram 1?
How do Figures 1 and 2 together show that the solar oven retains more thermal energy than the control setup?
A student claims: “A solar oven can maximize thermal energy transfer by increasing radiation absorbed inside the oven and reducing energy loss to the surroundings.” Do you agree or disagree? Use evidence from the investigation to support your answer.
Claim:
Evidence:
Reasoning: