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Light sources can be divided according to different criteria: Natural light sources that are all the time or occasionally present in nature without human intervention. Artificial light sources that were introduced by humans because of certain advantages. The most famous natural source is the sun, the most famous artificial source is ...
In luminous objects, the input energy transforms into light energy. Common forms of input energy are chemical energy, electrical energy, nuclear energy, and thermal energy. When designing a light source, engineers consider not only the brightness, location, attractiveness, and cost of the light source.
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.
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 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;
Some light bulbs get hot and are a heat source. You can use the temperature sensor to measure the amount of heat given off by a light bulb. Some light bulbs are energy efficient. Energy efficient bulbs emit light, but lose very little heat, so they are not a heat source.
The light we see can be divided into two categories: Light sources and reflected light. The sources of light can then be looked at in two sub categories: Natural light sources and artificial light sources. Both of these types of light sources can either come from hot sources or from cool sources. The organizer below will help you to follow this ...
