Light & Sound

How is a shadow formed?

• only when the moon goes in front of the sun

• when light from a light source is blocked by an object

• when an object stops producing light

• only during night time

Which type of dangerous radiation is produced by the sun?

(a)  

Which of the following things can UV radiation cause to our bodies?

• skin cancer

• hay fever

• damaged cells

• cataracts

• sunburn

Darkness is caused by...

• light reflecting on surfaces

• the absence of light

• the moon producing darkness waves

Light is required in order to...

• cook things

• see things

• water plants

What does the size and shape of a shadow depend on?

• the moon's position

• distance of light from an object/ screen

• size of object

• the brightness of a light source

How does light travel?

(a)  

Why can objects be seen?

• because light bends around objects

• because light travels in a straight line from a light source to an object and then to our eyes

• because light travels in a straight line from a light source to our eyes

Why do shadows have the same shape as the objects that cast them?

• because light bends around an object

• because light travels in straight lines

• because light travels through the object

Why can we hear sounds?

• because special radiation travels from the source of the sound to our ears

• because vibrations from the source of a sound travel through a medium to our ears

• because our ears have special sensors which detect sound radiation