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KS3 QCA Unit 8K
Light
41
Science
Not Applicable
06/03/2006

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Cards

Term
What is the speed of light?
Definition
3,000,000,000 m/s

or

300,000 km/s

Term
How long does it take for light from the Sun to reach the Earth?
Definition
8.5 minutes
Term
During a storm will you hear thunder or see lightning first?
Definition
You'll see lightning

Light travels much faster than sound

Term
Rays of light always travel in ...
Definition
straight lines
Term
A material that lets light through and enables you to clearly see objects through it is ...
Definition
transparent
Term
A material that lets some light through but doesn't let you see objects clearly is ...
Definition
translucent
Term
A material that doesn't let light through is ...
Definition
opaque
Term
When light 'bounces off' an object it is said to have been ...
Definition
reflected
Term
Light that gets through a material such as glass is said to have been ...
Definition
transmitted
Term
Light that gets stopped inside a material is said to have been ...
Definition
absorbed
Term
Objects such as the Sun or a light that produce their own light are said to be ...
Definition
luminous
Term
Name a luminous object
Definition
The Sun
A lightbulb
Term
Is the Moon luminous?
Definition
No
It does not produce its own light, it has been reflected from the Sun
Term
Light is reflected from a plane surface, such as a mirror, at ...
Definition
the same angle at which it hits it
Term
Objects viewed in a mirror are said to have been ...
Definition
laterally inverted - turned back to front
Term
The relationship of the angle between mirrors (A) to the number of images (N) is ...
Definition
A(N+1)=360
Term
The 'bending' of light when it passes from air into water or glass is called ...
Definition
refraction
Term
When light moves from a less dense material such as air into a denser medium such as water, how does it bend?
Definition
Towards the normal (inwards)
Term
The imaginary (often shown as dotted) line at right angles to a flat surface is called the ....
Definition
normal
Term
When a light ray travels from air to glass, the angle of refraction is ...
Definition
smaller than the angle of incidence
Term
White light can be split into what different colours?
Definition
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Term
What is the rhyme used to remember the order of colours when white light is split?
Definition
Richard Of York Gave Battle In Vain
Term
The effect of splitting white light into different colours is called ...
Definition
dispersion
Term
The glass shape used to split light is called a ...
Definition
prism
Term
The range of colours produced when white light is split is called a ...
Definition
spectrum
Term
Coloured filters only allow light of certain colours through. The others are ...
Definition
absorbed
Term
Light rays hitting a mirror are called ...
Definition
incident rays
Term
Light rays that have bounced off a mirror are called ...
Definition
reflected rays
Term
The angle at which light is reflected is called the ...
Definition
angle of reflection
Term
The angle at which light hits a mirror is called the ...
Definition
angle of incidence
Term
The angle of incidence = ?
Definition
The angle of reflection
Term
What effect explains why water always looks shallower than it is?
Definition
Refraction
Term
What effect explains why it is hard to tell where an underwater object really is?
Definition
Refraction
Term
What effect explains why a pencil in a glass of water looks bent?
Definition
Refraction
Term
The three colours, red, green and blue are called ...
Definition
primary colours
Term
What are filters?
Definition
Pieces of plastic or glass which only let some colours through

e.g. a red filter lets red light through, but absorbs green and blue

Term
A substance in which something, such as light, moves is called a ...
Definition
medium

e.g. glass is a medium in which light can travel

(plural, media)

Term
What does refract mean?
Definition
To bend a ray of light at the point where it enters or leaves water or glass etc. at an angle

{from re- + Latin 'fractum' = broken}

Term
What is a prism?
Definition
A triangular glass block that breaks up light into the colours of a rainbow

{plural, prisms} {adjective, prismatic}

Term
What is a spectrum?
Definition
1.The bands of colours seen in a rainbow
2. A wide range of things, ideas etc.

(plural, spectra) {Latin = image}

Term
What does 'dispersion' mean?
Definition
To scatter light

{from Latin 'dispersum' = scattered}

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