12 / 09 Tuesday Kaupapa: Describe the visible light of the electromagnetic spectrum

Do you remember? What are the seven EM radiations? Which one causes sun-burn? Which one is used in remotes? Which one has the highest frequency and energy?

The Seven Electromagnetic Radiations Radiowave Microwave Infra-Red Visible Light Ultra Violet X-ray Gamma Ray

Purple = Red & Blue Yellow = Red & Green Cyan = Blue & Green

White = ?

White = Red + Orange + Yellow + Green + Blue + Indigo + Violet

Remember: “ROYGBIV”

Demo – seven colours in the white light

Remember “Roygbiv” Visible Light Spectrum The visible light spectrum contains ALL of the colours (all frequencies in the range). We often divide them into the seven colours. Red (lowest frequency, least energy) Orange Yellow Green Blue Indigo Violet (highest frequency, most energy) Remember “Roygbiv”

Practical – Newton’s Disc

What have we learnt today? Name the seven colours in the visible spectrum in the order of frequency Which colour has the most amount of energy?