For more on light, and the terminology used to describe waves, you might like to look here, here and here. Meanwhile, here is an excellent explanation of the Doppler effect. As always, if you have any questions just post them in the comments below.
Raindrops…
This is a lovely video from MinuteEarth – a YouTube site all about our planet. It is a great explanation of how raindrops form. Apparently they could not do it without all the tiny bits of dust and other particles floating in the air. This idea that water needs something to get condensation going also applies to the …
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The Anthill Mob…
There are several ant nests on my property this year. I suspect that there have always been but this is the first time that they have been large enough, and sufficiently prominent, that I have noticed them. The one above is the biggest I have spotted so far. Every time I pass there is a great …
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Baby Birds…
These are the Great Tit chicks growing very quickly in the Summer Fields Nest Box. I think I can count six of them but it is difficult with them all bunched together. The parents are working tirelessly to feed them.
Oxygen Is (Roughly) 20% Of Dry Air…
I do love a snappy post title! Air contains lots of moisture. It can be as much as 30 g of water in every 1 m3 of air. If you dry the air (by passing it over a chemical that reacts with water) then the mixture remaining is slightly more than 20% oxygen. You can …
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Galvanised Into Action…
This is another post in the Rusting Series. Please make sure that you have read the others if you are here revising for upcoming exams – otherwise just relax and absorb. Many metals corrode over time; they become weaker as they react with their environment and often eventually break, crumble or otherwise fail. Iron (steel) …
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Lithium…
Lithium is the third element on the periodic table and first metal. It sits in Group I with the other reactive metals such as sodium and potassium. It is soft, low density and highly reactive – although the least so of the alkali metals. Apparently they used to put lithium citrate into 7-Up although they no …
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Rates Of Reaction…
A chemical reaction involves reactants turning into products. You can tell when a reaction has happened because there will be production (or sometimes absorption) of energy; usually in the form of heat but sometimes light & sound too. There may also be a change of colour but this doesn’t always happen. The end products will …
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Flowering Plants…
The above is a labelled diagram of an insect pollinated flower. You can tell that it is pollinated by an insect because of the large petals. In reality it would probably have a bright colour, pleasant smell and nectar to attract the pollinator. What do all the bits do? The anther and filament together are …
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Pressure…
I have never really written much about pressure on the blog. Perhaps it has always seemed a little dull but questions do come up about pressure so I ought to have a go. It ties in nicely with the posts about forces because pressure is force applied per square centimetre. At C.E. pressure will always …
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