Calculate the de Broglie wavelength of an electron in the first Bohr orbit of a hydrogen atom if the velocity of an electron in the first orbit is \(2.2\times 10^6\text{ ms}^{-1}\). [mass of electron \(= 9.1\times 10^{-31}\) kg, plank's constant (h) \(= 6.626\times 10^{-34}\) J s]