(Solved): 10. Calculate the wavelength of the light emitted by a hydrogen atom during the electronic transiti ...

10. Calculate the wavelength of the light emitted by a hydrogen atom during the electronic transition from the $n=4$ to the $n=1$ energy level. [a] $1.22\times 10^{?7}\mathrm{m}$ [b] $1.46\times 10^{?6}\mathrm{m}$ [c] $2.12\times 10^{?25}\mathrm{m}$ [d] $6.08\times 10^{?9}\mathrm{m}$ [e] $9.73\times 10^{?8}\mathrm{m}$ 11. In an electron microscope, electrons are accelerated to great velocities. Calculate the de Broglie wavelength of an electron traveling with a velocity of $7.0\times 10^6\mathrm{m}/\mathrm{s}$. [mass electron $=9.11\times 10^{?28}\mathrm{g}$ ] [a] $1.0\times 10^{?13}\mathrm{m}$ [b] $1.0\times 10^{?7}\mathrm{m}$ [c] $1.0\mathrm{m}$ [d] $4.86\times 10^{?9}\mathrm{m}$ [c] $1.0\times 10^{?10}\mathrm{m}$