LIGHT-2 .pptx

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1. Characteristics of light PREPARED BY: Jeymar Payumo

2. LEARNING OBJECTIVES IDENTIFY THE CHARACTERISTICS OF LIGHT CALCULATE THE INTENSITY OF LIGHT INFER THAT BRIGHTNESS OF LIGHT IS DEPENDENT ON THE DISTANCE OF THE SOURCE

3. El Gamma’s Touching Tribute to Mother Nature

4. PRE-ACTIVITY Complete the diagram by listing all electromagnetic wave in order 1 2 3 4 5 6 7

5. How do shadows formed? T he light rays were blocked by an object . T he light rays cannot pass through it, instead it creates an outline of the object

6. Electromagnetic Spectrum 1 2 3 4 5 6 7

7. V I S I B L E L I G H T

8. Have you ever seen a rainbow?

9. VISIBLE LIGHT SPECTRUM

10. VISIBLE LIGHT SPECTRUM

11. PHOTOMETRY Measurement of the brightness of a light source. 2 MEASUREMENT QUANTITIES OF LIGHT LUMINUOS INTENSITY - Measured of light source - Measured in terms of Candela(cd) LUMINOUS FLUX Rate at which light is emitted from the source Expressed in terms of Lumens(l)

12. How to calculate light intensity?

13. Intensity(I) = Power(P)/ Area(A) Suppose a light source(bulb) has 300 Watts. W hat Is the intensity of light if the distance from the light source is 20 meters. I=P/A

14. Suppose a light source(bulb) has 300 Watts. W hat Is the intensity of light if the distance from the light source is 20 meters. I=P/A P= 300 Watts; r= 20

15. Compute the intensity of the following. SEATWORK SOURCE OF LIGHT DISTANCE FROM THE LIGHT Incandescent bulb (100W) 1.5 m Incandescent bulb (200W) 3 m

16. ACTIVITY Read and analyze the following statements given. Tell whether the statement is true or false. ______1. I n the visible light spectrum, red has the longest wavelength. ______2 . In the visible light spectrum, violet has the highest frequency. ______3 . If a wave in a spectrum has the shortest wavelength, then it has the lowest frequency ______4 . The frequency of a wave is directly proportional to its wavelength. false ______5 . The energy of the wave does not depend on the wavelength and frequency .