The wave number of the light emitted by a certain source is 2x 106m. the wavelength of this light is
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Agriculture is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities. The history of agriculture began thousands of years ago. Wikipedia
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so sorry I don't know the answer of this question I will tell the answer of this question later after checking from net
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