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. Electromagnetic 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?