Light

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= Teaching Outlines =
 * 1) Light is a form of energy
 * 2) Light travels as electromagnetic radiation; with waves of different wavelengths
 * 3) Light interacts with material particles in discrete packets called photons
 * 4) Different wavelengths are associated with photons of different energies

Learning objectives

 * 1) Light is a form of energy and travels as electro-magnetic radiation. There are other radiations apart from light that travel as electro-magnetic radiation.
 * 2) It is possible to look at light and other electro magnetic radiation as a wave or as a particle known as the photon.

Notes for teachers
These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes. Light is a form of energy that is transported as electromagnetic radiation but interacts with material particles as discrete packets of energy that are called photons.

How do we know? Sun provides us with heat and light. This travels through the near vacuum of space. So there is no material to transport energy. When we block light we also block the heat radiation. Any source of heat also radiates some visible light. Heat a piece of iron and the iron changes colour from a dull grey to red to yellow to white when light of all wavelengths are radiated in addition to the heat. On a cold day the temperature inside a glass house is much higher – why? Because light of a shorter wavelength can travel through glass and is absorbed by the ground and plants. The ground reflects back radiation of a higher wavelength – infra-red and heat radiation. This cannot pass through glass and so the glass house is much warmer. Keep a black cloth under light and it will be distinctly warmer after sometime. From all this we can see the following: Energy is transported from a source to a destination without a medium The energy is of different kinds – heat, light of different colours, X rays etc One form of the energy can get converted to another. They must therefore have things in common - radiant heat and light are similar in many ways and different in some ways. Studies done on how light travels has helped us visualise it now as changing electrical magnetic fields that interact with other material objects as packets of energy..

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