Which statement is correct?
$m_e$ in kg | $9.1\cdot 10^{-31}$ |
$e$ in As | $1.602\cdot 10^{-19}$ |
$h$ in Js | $6.6\cdot 10^{-34}$ |
$\varepsilon_0$ in As/(Vm) | $8.85\cdot 10^{-12}$ |
$n$ | 1 | 2 | 3 |
$r$ in 10^{-10} m | $0.529$ | $2.117$ | $4.763$ |
$n$ | 1 | 2 | 3 |
$v$ in 10^{6} m/s | $2.188$ | $1.094$ | $0.729$ |
orbit number $n$ | 1 | 2 | 3 |
$E$ in eV | $-13.6$ | $-3.4$ | $-1.5$ |
The ionisation energy of Aluminium is 5.99 eV. Assume the energy level for 1st excited state is 1.99 eV and for 2nd excited state is 1.49 eV.
The characteristic X-ray spectrum for different elements is examined.
element | Al | Fe | Zn |
$\lambda_{K_\alpha}$ in 10^{-10}m | $8.36$ | $1.95$ | $1.45$ |
element | Al | Fe | Zn |
$\lambda_{K_\alpha}$ in 10^{-10}m | $8.36$ | $1.95$ | $1.45$ |
$E$ in keV | $1.48$ | $6.36$ | $8.55$ |
Niels Bohr | Danish physicist who described the atomic model with electrons circulating around the nucleus on certain energy levels. |
nucleus | The central area of an atom, consisting of protons and neutrons. |
electron transition | If atoms absorb enough energy, electrons can change their orbit. |
ground state | lowest energy level in an atom |
excited state | electrons on higher energy levels than ground state |
ionisation energy | energy for an electron to jump from the ground state to the top of potential wall. |
energy level diagram | a diagram which shows all possible states and the possible transitions |
Balmer series | Emission spectrum from Hydrogen which show only the transition to the 1st excited states. 4 lines are visible. |
dark lines in emission spectrum | occurs if the emitted spectrum is partly absorbed by the surrounding gas |
characteristic X-ray spectrum | Transition to the ground state (K-orbit) is named $K_\alpha,\: K_\beta,\: K_\gamma$ radiation. Transition to the first excited state (L-orbit) is named $L_\alpha,\: L_\beta,\: L_\gamma$ radiation. |