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Cosmic Distances:
If we asked you what the distance between Delhi and Kanyakumari is, you would say that it is roughly 3000 km. Another way of answering the question would be that a train takes.about 50 hours to cover the distance. And if we know the average speed of a train, we would get a fairly good idea of the distance. The dimensions of the universe are so large that using familiar units of distance like kilometres would make little sense, Therefore, cosmic distances are measured in'"ight years". One light year is the distance travelled by light. in one year. Now, light travels, about 300,000 kilometres in one second, i.e. its speed is 3 X 105 kms. At this sped it can travel seven times around the Earth in one second. A year has about 3X 107seconds (i.e. about 30 million seconds) in it. Therefore, the distance light travelsin one year is about
3 X 105m/s X 3 X 107s=9 X 102km, i.e. about nine trillion kilometres.
This unit of length is called a light year, It measures not time but distances, enormous distances. Space and time are interwoven. We cannot look out into space without looking back into time. If we see a galaxy a billion light years away, we are seeing it theway it was a billion years ago. Thus, the distance in units of light years also tells us how far back into time we are looking.
Determine the Sieve Analysis Method of Soil texture As the name suggests sieve analysis is done using sieves and may give a true distribution of soil particles. This method i
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what is weight of human in moon if his weight is 58 kg in earth?
For water immiscible/insoluble liquid/solid wastes which can be emulsified The spillage of water immiscible/insoluble liquid/solid could be scrubbed with brush in presence of
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Explain Rh Blood Grouping System Some individuals also have a so called Rh antigen on the surface of their RBCs. Those who have it are called Rh (+) and those who do not have i
Explain the Chronic Glomerulonephritis The repeated occurrence of acute glomerulonephritis, persisting proteinuria, hypertension and chronic renal failure may damage more and m
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Decline of the Bronze Age Civilisation: We find that the great developments in production methods that came with the rise of early cities lasted only f6r a few centuries. The
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