Light Waves

Question 1

What is the wavelength of Violet light

Answer 1

400nm

Question 2

What is the wavelength of red light

Answer 2

700mn

Question 3

What are the light primary colours

Answer 3

Red
Green
Blue

Question 4

What is white

Answer 4

All the light is reflected

Question 5

What is black

Answer 5

All the light is absorbed

Question 6

What are opaque objects

Answer 6

Do not transmit light
They absorb some light and reflect others

Question 7

How does colour work

Answer 7

The colour of the objects reflects the corresponding light (e.g. read apple reflects red light waves) and absorbs the rest

Question 8

What are transparent objects

Answer 8

Transmit light meaning some light passes through

Question 9

What are primary colour filters

Answer 9

Only transmits that colour (only the primary light colour is let through whilst the others are absorbed)

Question 9

What are non-primary colour filters

Answer 9

Lets both the wavelengths of the light of that colour and the wavelengths of the primary colours that can be added to make that colour

Question 10

Infrared radiation with hot objects

Answer 10

The hotter the object the more infrared radiation that it gives out
When an object emits more infrared radiation than it absorbs it cools down
Black objects are better at absorbing infrared radiation than other colours

Question 11

Leslie cube practical

Answer 11

Place an empty Leslie cube on a heat proof mat before pouring in boiling water
Wait for the cube to heat up and hold a thermometer against each surface to check that they are the same temperature
Hold an infrared detector a set distance from the cubes vertical surfaces
Should find that more infrared radiation is released from the matt black side than the white, shiny metallic surface or shiny black