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प्रश्न
The Wavelength of a particular colour is 5400Å. Express it in nanometer and metre.
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उत्तर
1Å=10-1 nm
So, 5400 Å= 5400 X 10-1 = 540 nm
1Å=10-10 m
So, 5400 Å= 5400 X 10-10= 5.4X 10-7 m
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