light

Which objects are sources of light?

Choose the four correct answers.

• burning firewood                                               

                                                       

                                          

• kettle

  lit

• candle     

• lit torch

• the Sun                    

Complete the sentence about how light travels.

 

Light travels in ________lines.

Ken says that he can see the candle flame through the tube.
Is he correct?

• Yes

• No

Jo arranges the cards in a straight line.

She can see the light from the candle through the holes.

When Jo moves one of the cards to the left slightly, she cannot see the light from the candle through the holes.

 

Explain Jo’s observation.

• Light bends around objects, so moving a card blocks the light.
  

• Light travels in straight lines, so moving a card blocks the path of light.
  

• Light disappears when objects are moved out of alignment.
  

• Light travels in curves, allowing it to be seen only when the cards are straight.

How does light travel from the street lamp to the boy’s eyes?
Choose the correct arrow.

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What is a ray diagram?

• A diagram that shows how sound waves travel using curved lines.
  

• A diagram made up of straight lines with arrows to show the direction of light travel.
  

• A diagram that represents the movement of objects using wavy lines.
  

• A diagram that shows how heat spreads through different materials.

Object X is not a source of light.

How can we see object X?

• it absorbs light

   

   

• it gives off light

• it reflects light

Choose the correct rays of light on the diagram to show how the girl can see the bird.

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Peter is in a dark room. There are no lights in the room. Can he see the walls?

• Yes, because his eyes adjust to the darkness and create light.
  

• No, because the walls do not give off or reflect any light into his eyes.
  

• Yes, because walls always glow slightly in the dark.
  

• No, but he can see the walls if he closes his eyes for a long time.

Yasmin prepares a set-up as shown below.
She sees light inside the box through hole B. Yasmin covers hole A.

Can she see light inside the box through hole B now? Choose 2 correct answers

• Yes, because the light stays inside the box even after hole A is covered.
  

• No, because no light reaches her eyes to allow her to see.
  

• Yes, because light can still pass through hole B.
  

• No, because covering hole A stops light from entering the box.