# B away from the normal at same speed to each other c

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b. away from the normal at same speed to each other.c. towards the normal line at different angles.d. towards the normal line at same speed to each other.14. Why is red colour always seen on top while blue is at the bottom of a rainbow?a. Blue has a short wavelength so it moves faster and refracted the most by droplets of water in the atmosphere.b. Blue has a long wavelength so it moves faster and refracted the most by water droplets in the air.c. Red has a short wavelength so it moves faster and refracted the least by droplets of water in the atmosphere.d. Red has a long wavelength so it moves faster and refracted the least by water droplets in the air.15. Light waves that are absorbed are transformed into heat energy. This is no longer reemitted as light energy. In which ofthe following processes is sunlight absorbed and transformed into heat energy?a. metabolismb. photosynthesisc. respirationd. transpirationOBJECTIVES:After going through this module, you are expected to:1. explain how photon theory accounts for photoelectric effect and atomic spectra;2. apply the wavelength-frequency-energy relationship in solving word problems;3. explain how the photon concept can be used to explain photographic dark rooms, sunburns, and our perception ofcolors;DISCUSSION:A. Particle Nature of LightThe concept of light as a quantized form of energy emerged during 1900s when Max Planck postulated the blackbodyradiation. This marks the beginning of quantum theory, which believes that energy comes in discrete units called quanta.Photon Concept and Its PracticalApplication
76Later on, Albert Einstein supported this idea of Planck and suggested that light is composed of tiny particles called photonand each photon possesses energy.1. Blackbody RadiationA blackbody- is a surface or object that is capable of absorbing all incoming radiation falling on it and reflects noradiation, thus appears black at room temperature. However, when exposed to certain amount of temperature,the blackbody radiates certain amount of energy with associated wavelength. For example, a visible light is beingemitted when the blackbody is heated to about 1000K, but the light becomes brighter and orange when thetemperature is increased to 1500K. Increasing the temperature further up to 200K, the light being emittedbecomes white. This phenomenon is known as blackbody radiation.In order to explain the blackbody radiation, Planck came up with an equation to explain the distribution of wavelengthsthat are emitted from a heated blackbody. It is given as E=hfwhere E is the energy of radiation;h is the Planck’s constant (6.626 X 10-34Js)f is the frequency (in Hertz)Planck also proposed the Quantum Theory which states that energy is radiated or absorbed in the form of packets orbundles, called quanta (singular, quantum) and each quantum is equal to hf.

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Atom, Test, Chemical polarity,