What is the correct order of colours in a rainbow?

Which colour of light has the highest energy?

Why does a red apple look red?

What colour does a leaf appear and why?

Which colour has the longest wavelength?

Which of these is a primary colour of light?

What happens when all colours of light are combined?

Why is the sky blue?

What does a prism do to white light?

Which colour of flame indicates the presence of sodium in a flame test?