text: Get a piece of wood, some nails, and some identical rubber bands. Hammer a row of nails into the wood at one end. Hammer nails at varying distances from the first row (such that one pair of nails is really far apart, the next a bit less, and so on.)\n\nStretch the rubber bands between each set of nails. Pluck them. See how they sound different? That's because they're vibrating at different frequencies. If you have a piano, figure out which note each of them is playing. If not, don't worry. Look up some basic information on sound (the shape of a sound wave, how they're transmitted) and write a couple of paragraphs on sound frequencies and pitch. \n\nIf you're feeling particularly interested, you could also look up what range of frequencies the human ear can hear, or what harmonics are. Since you've left it last minute, though, I doubt you're that keen. :)