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The Sun is the most important star from our point of view. It is the only star close enough to be studied in considerable detail. The grandeur of the Sun is partly because of its size. Its diameter is almost 110 times that of the Earth. We can best visualise the volume of the Sun if we realise that more than a million earths can be dropped into the space it occupies. As we have said above, the mass of the Sun is about 2 X 1033 grams, which makes it more than 300,000 times the mass of the Earth. The average density of the Sun, i.e.. its mass per unit volume, is about 1.4 g/cm3.
Although the Sun appears to be unchanging, it rotates about its axis once every 25 days. From time to time dark patches appear on the surface of the Sun, usually in pairsor in groups. These dark patches are called sunspots. Their movement is an indication of the Sun's rotation. This fact was recognised for the first tiine by Galileo. Actually, a sunspatis a regiim cn the surface of the S& that consists of gases almkt 10000c cooler than those surrounding the area. The number of sunspots increases and decreases in a cyclc every 11 years. In the long term, there are periods of low number of sunspots and High'number of sunspots.
Blowing soap bubbles Soap films and bubbles serve very well for observations on surface tension. You can make a good soap bubble solution by placing three level tablespoonfuls o
Determine about the soil humus The organic constituents (organic colloids) are due to mainly the plants and partly the animals. They form only a small fraction and get transfo
physical and chemical properties
Illustrating an eclipse of the sun Hold a small coin a few inches from one eye and close the other eye while looking at the lighted electric bulb on the ceiling of a room. The
Niacin (vitamin B3) Though niacin or nicotinic acid has been known to the organic chemists since 1867 and Funk isolated it from yeast and rice polishing in order to identif
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What time period can carbon-14 dates have? Carbon 14 has a half-life of 5,730 years, and thus it can be used to date very precisely a large majority of things, particularly woo
A model illustrating how an eclipse appears The sun is shown by an opal electric bulb shining by a circular hole 5 cm in diameter in a piece of blackened cardboard. The corona
Rutherford atomic model
How to calculate the student t test step by step when the mean of heart rate at 1 minute is 5.0,17.2,22.9,8.3,10,76.5,70,19.7 and for breathing rate it is 22.2,28.5,20,12.5,20,92,
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