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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.
QUESTION 1 (a) What is the main objective of the Occupational Safety and health Act 2005? (b) State 6 other objectives. Briefly describe them. QUESTION 2 (a) What cr
What is CEC The CEC of most soils increases with pH, below pH 6.0 the charge for clay mineral is relatively constant, while above pH 6.0 the charge on the mineral colloid incr
Making a simple reflecting telescope A simple reflecting telescope can be made from a concave mirror obtained from a shaving mirror. The mirror is arranged wooden box of suitabl
The physico-chemical properties of cyanocobalamin are as follows: a) The vitamin can be obtained in a crystalline form. b) It is freely soluble in water. c) Crystal
Explain how the uterus supports the development of a baby during gestation.
types, principle and working
Starch is a non-reducing substance , as except one carbonyl group, all other carbonyl groups are involved in glycosidic bond formation. It may be hydrolyzed by boiling with hyd
An x-ray diffractometer recorder chart for an element that has either the BCC or the FCC crystal structure shows diffraction peaks at the following 2θ angles: 40 0 , 58 0 , 73 0 ,
Important physico-chemical properties of pantothenic acid are as follows: a) Pantothenic acid is a pale yellow oily liquid that can only be crystallized as its sodium, potassi
Define Glucose and Fructose - Abnormal Constituents of Urine Abnormal Constituents of Urine The detection of abnormal constituents in urine indicates the presence of certa
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