Activity 8.8:
Aim: To study the scattering of light
Materials and apparatus: Milk powder, 1000 ml glass beaker, ray box, white screen.
Instruction
1. Carry out this activity in the dark.
2. Set up the apparatus as shown in Figure 8.23.
3. Turn on the ray box.
4. Add a few tablespoons of milk powder into the water. Stir the water until you can see a beam of light that shines through the mixture.
5. See the light beam from the side of the beaker. Then, look at the white screen as shown in Figure 8.23.
6. Add more milk powder and observe the colour change of the white light beam at the side of the beaker and on the white screen.
7. Record your observation.
Questions:
1. What is the function of adding milk powder into the water?
2. What is the difference between the beam of light as seen from the side of the beaker and the beam of light on the screen? Explain your answer.
Answer:
1. Milk powder acts as particles that scatter light to all directions.
2. The beam of light looks bluish white from the sides and reddish yellow on the screen.
Blue light scatters more than red light.
Aim: To study the scattering of light
Materials and apparatus: Milk powder, 1000 ml glass beaker, ray box, white screen.
Instruction
1. Carry out this activity in the dark.
2. Set up the apparatus as shown in Figure 8.23.
3. Turn on the ray box.
4. Add a few tablespoons of milk powder into the water. Stir the water until you can see a beam of light that shines through the mixture.
5. See the light beam from the side of the beaker. Then, look at the white screen as shown in Figure 8.23.
6. Add more milk powder and observe the colour change of the white light beam at the side of the beaker and on the white screen.
7. Record your observation.
Questions:
1. What is the function of adding milk powder into the water?
2. What is the difference between the beam of light as seen from the side of the beaker and the beam of light on the screen? Explain your answer.
Answer:
1. Milk powder acts as particles that scatter light to all directions.
2. The beam of light looks bluish white from the sides and reddish yellow on the screen.
Blue light scatters more than red light.