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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.
Acid Rain: A side effect of air pollution is acid rain, which is now of common occurrence. You might have seen, that some industries build very tall smoke stacks to protect t
Microwave Processing Factors Frequency: There are two available frequencies for microwave heating - 915 and 2,450MHz; the frequency affects the depth of penetration into
TO SURVEYS A LAB FOR ITS FIRE PREPAREDNESS As said earlier in this activity you are going to survey the labs of the institution where you are working at. Look for the fire safe
Objectives After doing this exercise, you should be able to: 1. Prepare a list of contact phone numbers required for handling laboratory accidents, state the contents of fir
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How is our atmosphere different from the atmospheres on Venus and Mars? Earth's atmosphere is different from those of Venus and Mars. This difference lies essentially in their c
What do all optical instruments and devices have in common?
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Objectives After studying this unit you should be able to: 1. state the principal hazards of biology lab work, 2. describe the ways to minimize these dangers, 3. ex
Jupiter Jupiter is the largest planet of the Solar System. If Earth were placed on the face of Jupiter, it would look like a 50 paise coin on a dinner plate. It weighs mor
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