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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 ...
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
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 ...
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.
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.
Energy cheat sheet What is energy? Energy is the ability to make changes or the capacity to do work. Energy appears in many different forms including kinetic (movement), potential (stored energy), gravitational, light, heat, chemical, elastic and electrical. The Sun is the source of all energy on Earth. The energy from
1. The Sun is a medium sized star producing light and heat energy. 2. Day and night happen because the Earth spins on its axis (rotation). 3. Shadows of still objects move during a sunny day because the Sun appears to travel in an arc across the sky. 4. We have the 12-month calendar due to the Earth moving around the Sun (revolution). 5.
