Light 
Q1.
(a)     Figure 1 shows what happens to rays of light incident on three different surfaces.
Figure 1

Which one of the diagrams shows diffuse reflection?
Tick one box.
 
A		B		C		
(1)
(b)     Figure 2 shows what happens to the energy transferred by a ray of light when the ray of light hits a glass block.
Figure 2

Calculate the percentage of the energy absorbed by the glass block.
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Percentage of energy absorbed = ____________________ %
(1)
(c)     Viewing an object through a colour filter may make the object look a different colour.
Complete the sentences.
Choose the answers from the box.
 
absorbs	black	blue	
red	reflects	transmits	
A red object viewed through a blue filter will look ____________________.
This is because the red object only ____________________ red light and the
blue filter only ____________________ blue light.
(3)
(d)     A white surface is viewed through a green filter.
What colour will the surface look?
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(1)
Cyclists often wear clothing that reflects a lot of light.
Figure 3 shows a student investigating which colours are best at reflecting light.
Figure 3

This is the method used.
1.      Small squares of different coloured material were stuck onto a piece of black paper at one end of a darkened laboratory.
2.      The student switched on a torch and walked slowly towards the coloured squares.
3.      The student stopped walking as soon as he could clearly see a coloured square.
4.      The student measured the distance between the torch and the coloured square.
(e)     Give a reason why it was important the student did the investigation in a darkened laboratory.
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(1)
(f)      Give a reason why it was important the area of each coloured square was the same.
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(1)
The table shows the student's results.
 
Colour of square	Distance from the torch to the square in metres	
Blue	2.3	
Brown	2.1	
Green	3.2	
Orange	3.4	
Red	2.6	
Figure 4 shows a bar chart with only three of the student's results.
Figure 4

(g)     Complete the bar chart to show all of the results.
(3)
(h)     Which colour clothing would be best for a cyclist to wear?
Use the data from the table.
Tick one box.
 
Blue		Brown		Green		Orange		Red		
Give a reason for your answer.
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(2)
(i)      The student did the investigation again to obtain a second set of results.
The second set of results showed the same pattern as the first set.
Complete the sentence.
Choose the answer from the box.
 
accurate	precise	repeatable	reproducible	
The measurements taken by the student were ____________________ .
(1)
(Total 14 marks)