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Gaurav Seth 6 years, 7 months ago
अरुणाचल प्रदेश
इंडिया में जहां सबसे पहले सूर्योदय होता है उस राज्य का नाम अरुणाचल प्रदेश है. जिसका नाम उगते हुए सूर्य को ध्यान में रखकर रखा गया है. अरुण यानी सूर्य और चल यानि उदय होना इस तरह अरुणाचल का अर्थ होता है सूर्य का उदय होना. अरुणाचल प्रदेश को उगते सूरज की भूमि भी कहा जाता है. क्योंकि इस राज्य की जमीन में सबसे पहले सूर्य की पहली किरणें कदम रखती है.
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Sia ? 6 years, 7 months ago
कार्बन-14 का अर्थ :- भौतिक विज्ञान के अनुसार सभी वस्तुओं, पौधों और जानवरों में रेडियोएक्टिव कण होते हैं जिसे कार्बन-14 कहते हैं।
कार्बन-14 का उपयोग निम्नलिखित रूप में किया जाता हैं :-
- रेडियोएक्टिव वस्तुएँ ऐसे पदार्थ हैं जो एक निश्चित गति से छोटे-छोटे कण छोड़ते हैं। किसी वस्तु की आयु ज्ञात करने के लिए कार्बन-14 का प्रयोग किया जाता है।
- दूसरे शब्दों में, कार्बन-14, वातावरण में उपस्थित नाइट्रोजन-14 के अंतरिक्ष किरणों द्वारा परिवर्तित होने से, बनता है। यह कार्बन-14 वातावरण के ऑक्सीजन से मिलकर रेडियाऐक्टिव कार्बन डाइऑक्साइड (C14O2) बनाता हैं, जो पृथ्वी पर पहुँचकर प्रकाश संश्लेषण द्वारा पौधों में अवशोषित हो जाता है और इनसे उन पर आश्रित जंतुओं में पहुँच जाता है।
- मृत्यु के बाद कार्बन-14 का अवशोषण बंद हो जाता है तथा उपस्थित कार्बन-14 पुन: नाइट्रोजन-14 में परिवर्तित होकर वातावरण में लौटने लगता है।
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Sia ? 6 years, 7 months ago
Mesopotamia is in the republic of Iraq. It is the region situated between two world famous rivers; Euphrates and Tigris. The ancient Mesopotamian civilisation also flourished in this region.
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Yogita Ingle 6 years, 7 months ago
Mesopotamia, known as the “cradle of civilization”, is located in modern Iraq. Human civilization first began here around 3500 BC. Here, agriculture began between 7000 and 6000 BCE. Mesopotamia was earlier known as Sumer and Akkad; the Sumerians developed the earliest-known writing called Cuneiform.

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Anup Prasad 6 years, 7 months ago
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