Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object’s atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.
SOURCES OF ENERGY
LED (Light Emitting Diode)
Uses of light energy
It helps us to see things.
It helps plants to make food and grow.
It is used in power satellites and space stations.
It is used in many electronic appliances.
The energy of light from the sun can be harvested to solar panels and can be used for domestic use since it is eco-friendly and cost effective too.
Materials that can reflect light
Smooth and shinning surface like glass, water, or polished metals.
Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound energy is a form of mechanical energy.
Today’s Use of Sound Technology
Video Tape Recorders
Strategies & Activities:
Step: Teacher revises the previous topic.
Step 2: Teacher introduces the new topic.
Step3: Teacher explains the new topic.
Step4: Teacher welcomes pupils’ questions.
Step5: Teacher evaluates the pupils.
Assessment & Evaluation:
- explains the sources and uses of light energy.
- Show that some objects reflect light.
- Sound energy.
- Some musical instrument.
- Explains two sources of light energy.
- List three materials that can reflect lights.
- Explains the meaning of sound energy.