WORKSHEET 16.1-FUNDAMENTALS OF LIGHT 1. Explain the dual nature of light. 2 What

Question

WORKSHEET 16.1-FUNDAMENTALS OF LIGHT 1. Explain the dual nature of light. 2 What evidence do we have that light waves travel in straight lines? 3. Define light 4 What are the colors of the visible spectrum and what range of frequencies and wavelengths correspond to these colors. 5. What is the value of the speed of light in a vacuum? 6. Distinguish between a luminous body and an illuminated body 7. Define the following terms and indicate the units used to measure them: luminous flux illuminance, luminous intensity. What equation relates luminous flux to illuminance? What are the two ways to increase the illumination on a surface? 9. Distinguish between transparent, translucent, and opaque. 10. What three things can occur to light waves when they strike a surface? Complete problems 1-6 on page 436

Explanation / Answer

1) dual nature means the particle as well as wave nature.

the particle nature of the light has expained in Young's double sti experiment,

and the wave nature of light explained in photoelectric effect of light

2)

from the card board experiment when we keep any object in front of pin hle the light does not travell . when we remove the obstacle then it travell in that path and can be visible on other side of screen

3)

Light is a form of energy . it is an electromegnetic wave and can travell through empty space.

4)

all the seven colour i.e Red, green, orange, yellow ,Indigo Violet, blue.

the range of wavelength is

5) speed of light in vaccum is

c=3*108 m/s

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