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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.
Life in Forests: Trees are the pillars of the forest upon which much of the other forest life is shaped. Associated with them, there may be more than a thousand kinds of s
Mr. X is probably well adjusted (Mt=42). Neither he nor others see him as anxious (Pt=59), and he either denies or does not experience depressiveness (DEP=41). He does not wake up
A rain gauge Mount your wind speed indicator in a place that is exposed to the wind from all directions. 4 A rain gauge It is simple to make a easy rain gauge using a funnel an
Explain the Actions of Autonomic Nervous System (ANS) The actions of the autonomic nervous system are largely involuntary (in contrast to those of the somatosensory system). Th
Origins of Science: We have seen that the primitive human beings acquired different kinds of knowledge from the use of implements and tools, from cooking on fire. from huntin
does air is conductor
Shut -down Sequences : In some respects, the time when the lab is being shut down is potentially one of the most dangerous periods of the day. For example, at the end of a day's w
INTRODUCTION : You read about the fire hazards, general precautions and remedial measures in case of an outbreak of fire in the previous unit. In this unit you will learn about t
why- 1) alcoholic acidity is determined? 2) ash content is important factor in wheat flour? 3)carbohydrates and sugar are separately denoted on pachaging material?
Explain Cough reflex Actions - Respiratory Process Cough reflex causes cough due to irritation of some receptors in tracheo-bronchial tree. It is a protective reflex. The irrit
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