Third Grading Module 4 Light
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Light can behave as both a particle and wave. It is an electromagnetic wave that is visible to the human eye and is responsible for sight. Several scientists throughout history studied the nature of light, including Isaac Newton who believed it behaved as particles, Christian Huygens who believed it behaved as waves, and Max Planck who proposed light has both wave-like and particle-like properties. James Clerk Maxwell later unified concepts of light, electricity, and magnetism in his electromagnetic theory of light.
Third Grading Module 4 Light
- 2. what is light??? responsible for the sense of sight. light is a transverse and electromagnetic wave. travels in a straight path.
- 3. first to study light Sir Isaac Newton Christian Huygens Max Planck James Clerk Maxwell
- 4. Sir Isaac Newton he believed that light behaves like a particle.
- 5. Christian Huygens he believed that light behaves like a wave.
- 6. Max Planck came up with what is now known as the Dual- Nature of Light.
- 7. Max Planck He explained that light can be a particle and can also be a wave.
- 8. James Clerk Maxwell he proposed the electromagnetic theory of light.
- 9. James Clerk Maxwell He combined the concepts of light, electricity and magnetism to come up with his theory forming electromagnetic waves.
- 10. Sources of Light Natural sources – like the sun Artificial sources – like bulbs, lamps, candles ***luminous body – an object capable of producing its own light.
- 11. energy to light many forms of energy transformation can produce light. ex. in oil lamps (chemical -> light) in fluorescent bulb (electricity -> light)
- 12. brightness depends on the source and distance from the source. it also depends from person to person (qualitative) it can be computed (quantitative)
- 13. Candela (cd) is the unit used to express the brightness of an object capable of producing light.
- 14. Electromagneti c Spectrum is the arrangement of electromagnetic waves according to frequency
- 15. White Light the visible part of the electromagnetic spectrum that can be seen by the human eye. also known as visible light.
- 16. Wavelength
- 17. ROYGBIV red has the longest wavelength but lowest frequency. violet has the shortest wavelength but highest frequency
- 18. ROYGBIV red has the lowest energy violet has the highest energy
- 19. energy, frequency, wavelength frequency = energy frequency = energy wavelength = frequency wavelength = frequency
- 20. Health Issues UV rays are highly energetic than other spectral regions on its left. This could be a possible reason why we are not advised to stay under the sun after 9:00 in the morning.
- 21. Prolong use of mobile phones may cause ear infection. This may be due to a higher energy emitted by microwaves used in cellular phones than radio waves commonly used in other communication devices.
- 22. Prism a material that splits light into its different colors. used by Sir Isaac Newton
- 23. Dispersion is a phenomenon in which a prism separates white light into its component colors.
- 24. Color Spectrum
- 25. WHY???
- 29. MENTAL EXERCISE
- 30. 1. What part of the human body can perceive light?
- 31. 2. Sir Isaac Newton believed that light behaves like a _______.
- 32. 3. __________ proposed the dual nature of light.
- 33. 4. In oil lamps, light is produced through the conversion of _______ energy to light energy.
- 34. 5. An object that has the ability to produce light.
- 35. 6. Unit used to express luminous intensity.
- 36. 7. Light wave does not need a medium to travel and thus classified as _____.
- 37. 8. An object that splits light into its different colors.
- 38. 9. The different colors of light is known as _p_c_ru_.
- 39. 10. Which color of light has the longest wavelength and carries lesser energy?