Child's Idea About Light Concept - Assessment

Added on - 28 May 2020

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A CHILD’S IDEAS ABOUT A LIGHT CONCEPTAssessment2A child’s ideas about a science concept:Part A Science ResearchLight is the energy that makes it possible for human beings and animals to see the world.Light originating from different sources referred to as sources of light. One's eyes are able tosee variety light wavelength as different colours. Through light, technology around us ispowered. Various form of how technology around is powered by light comprises of, camerasrecord light as it reflects off objects. Telescopes use lenses to bend light, laser beams makethe DVD players and CD and printer possible ("Summary • Light energy", 2016).There are various sources of light. They have been categorized into two: Natural sources andArtificial sourcesNatural sourcesThe universe has many objects that emit light. Light emitted from these sources are able toreach the earth, but only some of it . (Jus, 2018).The following are the sources of naturallight.Sun is a major source of light in the world.. The sun is an enormous ball of fire,having the nuclear fusion at its centre producing immense energy. The light that isemitted by the sun is one of the main factors for the life on earth sustainability (Jus,2018).The energy emitted by the sun come out as light and heat.The moon is another source of light. The moon on its own is not capable of producinglight. However it reflects light from the sun.2
A CHILD’S IDEAS ABOUT A LIGHT CONCEPTBioluminescence is the ability of a living organism to produce light. This light isproduced by the effects of a particular chemical reaction within the organism.Example of these organism comprises of, fireflies, jellyfish, and some deep sea plant.Artificial sourcesArtificial sources of light are those light that produced artificially. They are mostly known asthe man-made light. These source of light can be categorized into three different sources.Incandescent sources-the light is emitted from particular objects that have beenexposed to a high-temperature heating. In the process, there is the production of bothvisible light and infrared light. Example include candle.Luminescent sources-through acceleration of charges in a luminescent material, lightcan be produced. The most used way of producing light is through transitory currentover the material. Example include electric bulb.Gas discharge sources-light can be produced through the passing of electricity at lowtemperature through certain gases. Example include. Neon lamp.Characteristic of lightLight has various characteristics and features. Some of these features include: First, lighttravels only in a straight line. Second light travels at a very high speed of 332 meters persecond through the air as a medium of transmission. Thirdly light can be diffracted, reflectedand refracted (Meena, 2016).Shadows and eclipseA shadow is referred to as a black region that is formed on a wall when the light hits anopaque object. Opaque objects are objects that do not permit light to pass through it. Sincelight cannot pass through a solid object, a black area is noted on the screen. Umbra refers tothe dark area on the wall. Penumbra refers to the area surrounding the region that is dark.Depending on the source of light position and the distance that light is from the object,3
A CHILD’S IDEAS ABOUT A LIGHT CONCEPTshadows do change correspondingly ("Summary • Light energy", 2016).Formation of eclipseWhen there is the prevention of transmission of light from the sun to the earth, eclipse isformed. Nonluminous body refers to bodies that do not produce their own energy, an exampleis a moon. The shape of the moon will change as it orbits the earth. During occurrences whenhalf-moon is seen, this clearly means that only half moon is reflected by the sun. Eclipse iscategorized into two, lunar and solar eclipse ("Summary • Light energy", 2016)A solar eclipse takes place when the moon blocks out all the rays from the sun from reachingthe earth. During this occurrence, some parts of the world experience partial darkness whileothers experience total darkness. For the solar eclipse to happen, the moon has to be betweenthe sun and the earth ("Summary • Light energy", 2016).The lunar eclipse-lunar eclipse occurs when the rays from the sun are blocked by fromreaching the earth by the moon. During such occurrences, some of the earth regionexperience total darkness while other experience partly blackout ("Summary • Light energy",2016).Reflection of light refers to the bouncing back of the light once it strikes a surface that issmooth or polished ("Light Absorption, Reflection, and Transmission", 2016).Terminology of reflection of lightReflected ray -is the ray directed outwards from the surface.Angle of incidence- is the angle between the normal ray and the incident rayAn angle of reflection -is the angle between the normal ray and the reflected ray.The normal ray- is the ray perpendicularly to the surface that is polished or smooth.Light refraction.Light has the capability of traveling through various materials. The direction at which lighttravels can change, the bending or changing of light direction refers to the refraction of light.4
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