Light & Sound – Year 3 & 4

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Light and Sound for KidsLight sound for kids at Super Brainy Beans. Science homework help with how light travels with light games and how sound is created. For children in Year 3 and 4, Key Stage 2 (KS2).

Light

We all need light in order to see things. We get light from different light sources, the sun, the stars, flames and light blubs. If we didn’t have light it would be dark.

For us to see the things round us, the light from the light source bounces off these objects and into our eyes. Our desk, cup or pen doesn’t give off it’s own light, it just reflects light into our eyes.

Some objects are more refective than others. Shiny objects, like a mirror, reflect all of the light that shines on them. Other objects which are dark, such as a table, absorb most of the light that shines on them.

WARNING!

The sun gives off very strong light and you must NEVER look directly at the sun. Sunglasses protect your eyes from the sun but you can still damage you eyes if you look at the sun through sunglasses. What could happen? You can go blind, and that’s not just something your parents say, its a fact.

Shadows

Light travel in straight lines which means it can not bend. So when something gets in the way it forms a shadow, an area of dark where no light can get to.

Shadows change depending on how close the light source is to the object. If the object is close to the light source you will get a big shadow. If the object is far away from the light source you will get a small shadow.

Hands onShadows – Find a torch or a lamp and put your hand in front of it to make a shadow. See what happens to the size of your shadow when you move your hand forward and back from the light source. What do you notice?

Light and ShadowsLight & Shadows
Click and drag different objects into the path of the light. Which make the best shadows?

Sounds

We hear sound when something vibrates. The vibrations make the air next to it vibrate and they travel to our ear to vibrate our ear drum. Vibrations can travel through materials, like walls, glass and water. Have you ever been swimming and gone under water? What does it sound like? It sounds sound different don’t they? This is because the vibrations get distorted in the water, and it is not so clear when it get’s to our ear.

What changes the sound?

Loud noises create more vibrations. Quiet noises create smaller vibrations.

Sounds that are far away are quieter because the longer the vibration has to travel the more it will die out. Sound that our near to us sound louder as we hear them when the vibration is at the strongest.

SoundSound and hearing
Listen to the different sounds and work out which ones are loudest.

Pitch of a sound

A pitch is how high or low the note is. A pitch is changed by making the string that you are vibrating shorter or longer. A short or small vibrating string will give you a high pitch. A long or large vibrating sting will give you a low pitch.

Changing SoundsChanging Sounds
Pluck the guitar string gently and strongly. Hear the difference in the sounds.

Hands onMake your own instrument – All you need is a box and different sized elastic bands. Tie them around the box. Try plucking the bands. How do they sound? Do you notice that the small elastic bands have a different pitch to the large ones?

Vidoes on how sound works

SoundSound
The deadly Rakweed is threatening the UK! Help Clyde defeat it with sound in this exciting Sarah Jane Adventures game.

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Year 1 & 2 Year 5 & 6

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