According to De-brogile's wavelength associated with an electron ;\\\\(\\lambda =\\dfrac{h}{mv}\\\\)......1and the standing wave condition that circumference \\\\(=\\\\) whole Number of wave length If 'n' is the nth orbit\\\\(\ herefore 2\\pi r=n\\lambda n\\\\)....2\\\\(\ herefore \\\\) since angular momentum \\\\(L=mvr\\\\) from eqn (1)\\\\(L=\\dfrac{hr}{\\lambda}\\\\)\\\\(=\\dfrac{hr}{\\left(\\dfrac{2\\pi r}{n}\\right)}\\\\) from 1 and 2\\\\(\ herefore L=\\dfrac{nh}{2\\pi}\\\\) Bohr's Quantization condition