Define unified atomic mass unit. Calculate its energy equivalent. In an atom X, electrons absorb…
Physics20255 marksShort answer
(a)[1.6666666666666667]
Define unified atomic mass unit.
(b)[1.6666666666666667]
Calculate its energy equivalent.
(c)[1.6666666666666667]
In an atom X, electrons absorb the energy from an external source. This energy “excites” the electrons from a lower-energy level to a higher-energy level around the nucleus of the atom. When electrons return to the ground state, they emit photons.
Figure 10 below is the energy level diagram of atom X with three energy levels, $E_1 = 0\cdot 00\text{ eV}$, $E_2 = 1\cdot 78\text{ eV}$ and $E_3 = 2\cdot 95\text{ eV}$. The ground state is considered $0\text{ eV}$ for reference. The transition of electrons takes place between levels $E_1$ and $E_2$.
(1) What wavelength of radiation is needed to excite the atom to energy level $E_2$ from $E_1$?
(2) Suppose the external source has a power of $100\text{ W}$. What would be the rate of photon emission?
