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The Sun is the major source of light for the earth. The sun is a massive ball of fire, at the centre of which nuclear fusion produces massive energy. This energy comes out as heat and light.
Light energy is also known as Radiant energy. The Earth gets a lot of its energy from the light of the Sun. Plants take light energy from the sun and convert it into chemical energy (food) which helps them to grow, this is known as photosynthesis .
Track and visualize how energy flows and changes through your system. Explore how heating and cooling iron, brick, water, and olive oil adds or removes energy. See how energy is transferred between objects.
A natural light source refers to a light source that is able to give off light naturally. For example, the Sun , which lights up the Earth during the day, is a natural source of light. The stars that we see in our night sky, together with fireflies and lightning , are other examples of natural light sources.
The light energy they absorb usually turns into heat and raises their temperature. Mercury, steel, and wood are examples of opaque substances. Translucent substances permit some light to pass through them, but the light is scattered, and the images of objects behind them are not retained.
The sun is our planet’s major natural source of light. It radiates light and heat, which we use as energy. Plants use it to grow too! Stars create light via a process called nuclear fusion. Every second, a star is converting 4 million tons of its material into heat and light through nuclear fusion.
In this module students are introduced to the characteristics and properties of light energy, its uses, and various sources of manmade and natural light. By completing computer and hands-on activities, students experiment with the concepts of transparent and opaque objects, shadow and reflection.
