Habid(10) asked “How do people make light?”

I asked my friends about this

light

When you think about how we (people) make light you end up with quite a small number of possibilities. The obvious one is ‘fire’ then along came electricity which is ‘in a sense’ another form of fire. When it passes through very thin wires it makes them heat up, they glow red and then become ‘white hot’ and give off lots of light. When you pass electricity through some gases they ‘light up’. 

Light remember, is a form of energy and can therefore be changed to other forms of energy. See the Science Master Special on Energy

Then there are the sources of light which are not made by people. How many of those are there? Go to the ‘Leave a Reply’ area below and tell us .

Abdur asked: I got lazer and pointed it in my tea.Then I looked up and I could see the reflection on the ceiling. Doesn’t only mirrors reflect things?

An interesting question Abdur. I asked my team to have a think about it and as usual they came up with more questions.

reflection

I think we could investigate some of the statements that my team came up with. If it was very dark would you be able to see the tree?  Think about why you see things. Do you see the tree because it creates it’s own light? Maybe it is not only mirrors that reflect light? Abdur saw the laser beam on the ceiling when he was shining it at the surface of his cup of tea. Maybe the ceiling can reflect light? You look at your hand and you can see it. Is it producing it’s own light or is it reflecting light?

I think you need to do an experiment. If you have access to a light detector (some schools have them) look at the light reflected from different surfaces. Try a mirror, try a white surface, try a leaf, try a black surface and see how much light the different surfaces reflect. Some cameras also have light meters.

Sharif (age 10) asked “If darkness is the absence of light why can we see darkness?”

darkness

Thank you team. It was a difficult question. Maybe we need to think about our eyes and the way that they work? The eye converts the light to signals that it send to the brain. The brain then interprets those signals. It could be argued that it interprets no signal (no light) as ‘darkness’. Disagree then click on the Reply button below or if you have other ideas

Jam(10) asked “How did Issac Newton discover light?”

Jam … I asked my friends about this. Maybe you and my friends could find an answer.

Newton

What was one of the things that Newton found out about light? Look at the picture above. Does that give you any clues? Does something like this happen outside of the classroom? Want to know more?