Energy Transfer Unit Test

Question

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Question
List three things that use light energy, and explain how they use it.(4 points)

Answer 1

Here are three examples of things that use light energy, along with explanations of how they utilize it:

1. Plants (Photosynthesis):

   • Plants use light energy from the sun during the process of photosynthesis. They capture sunlight using chlorophyll, the green pigment in their leaves. This light energy is then converted into chemical energy in the form of glucose, which serves as food for the plant. The process also produces oxygen as a byproduct, which is essential for most life forms.

2. Solar Panels:

   • Solar panels are devices that convert light energy directly into electrical energy through the photovoltaic effect. When light photons hit the solar cells, they knock electrons loose from their atoms, generating a flow of electricity. This electricity can then be used to power homes, businesses, and various electronic devices.

3. The Human Eye:

   • The human eye uses light energy to enable vision. When light enters the eye, it is focused by the lens onto the retina at the back of the eye. The retina contains photoreceptor cells (rods and cones) that detect the light and convert it into electrical signals. These signals are then sent to the brain, where they are interpreted as images, allowing us to see.

These examples illustrate the diverse ways in which light energy is harnessed in nature and technology.