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The sun is the main primary and natural source of light. Natural light sources. The moon is also natural light source. However, the moon is secondary light source, because it only reflects light of the sun. Natural light sources. Sky and clouds are also natural light source.
NEL 10.1 Light Energy and Its Sources 291 Thermal energy can heat a metal to such a high temperature that it emits light. This light ranges from dull red to yellow to white and blue-white as the metal gets hotter. The colour of the emitted light indicates when the molten metal is ready to be poured. Light from Phosphorescence
identify conventional and non-conventional sources of energy used in India; distinguish between renewable and non-renewable sources of energy; describe various types of sources of energy e.g. fossil fuels, water, wind, biomass, sea, geothermal, nuclear energy; recognise that the sun is the ultimate source of energy;
Discover: What do I know, think, and feel about energy sources on Earth? Understand: What are some different perspectives related to energy sources? Act: What are the characteristics of sustainable energy?
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.
identify a number of ways of obtaining the energy needed to do something; discuss where their own energy comes from; list different sources and forms of energy that could be used to replace electrical appliances; evaluate different ways of obtaining electrical energy.
þ Describe the sources and effects of heat. þ Explain thermal expansion of solids, liquids and gases. þ Explore the effects and applications of expansion and contraction of solids.
