Reflecting Colour Materials Required: A coffee mug A paper with printing on it Mylar mirror Glue As you know, the rays of light from the sun or an electric bulb are white but in reality they are made up of many colours. Let us understand how objects get their colour from the colours reflected off them. When all the colours in white light are reflected, the object appears white. If an...

Sunlight and Colours Materials Required: 1. Colored construction paper 2. Adhesive tape 3. Safety scissors 4. Drawer cabinet Sunlight is good for plants but it might not be as good for household furniture. A window side may not necessarily be the best place for your couch. What if the strong rays from the sun fade color. Collect two pieces of red, orange, yellow, green, blue and black construction paper. Cut two...

Detecting Radio Waves Materials Required: An electric shaver A cordless telephone Fluorescent light An electric blanket An electric hair dryer AM radio Personal Computer Television Radio frequency energy can neither be seen, nor heard. They are caused by electromagnetic waves, which travel through the air. This type of energy is responsible for the functioning of televisions, radio, cordless phones and walkie-talkies to name a few. However, there are many things which...

Tracking Radio Waves Materials Required: AM pocket radio Aluminium foil Table Radio and TV stations send I’ out powerful waves of their TV respective kinds through antennae, which get caught by our radios and televisions. To determine the direction through which these waves reach you, take a portable AM pocket radio and place it on a table. Now tune in to a station which is coming in properly Fold a piece...

Refraction in a Telescope Materials Required: Two hand magnifying glasses Modelling clay Table near a window White paper Sunny day Two pieces of cardboard A telescope allows objects to appear close. It is made up of the Greek word “tele” meaning ‘from afar’ and “skopos”, meaning ‘viewer’. Telescopes gather light and focus it and this allows objects to appear closer than they actually are. Telescopes reveal things in the sky which...

Measuring Distance with Sound Materials Required: A large building Measuring tape The speed of a sound wave is generally fixed at 335 metres per second. When the energy waves actually move, the molecules of the medium it moves through (like metal, water, air) do not travel forward with the wave. To understand things better, let us return to the example of the wave. When a wave moves in the ocean, the...

Inside the Eye Materials Required: Hand magnifying glass Modelling clay A few small toys High-intensity desk lamp Adhesive tape A strip of white paper Table A pair of scissors An adult Images are magnified through binocular and telescope lenses. However, we often forget that the first tool used in astronomy is the human eye. Objects reflect light that go in through the pupil, then pass through the lens. This focuses the...