Question

The figure above shows the electron energy levels, referred to the ground state (the lowest possible energy) as zero, for five different isolated atoms. Which atom can produce radiation of the shortest wavelength when atoms in the ground state are bombarded with electrons of energy $W$?

• A. $A$
• B. $B$
• C. $C$
• D. $D$

Answer 1

Answer: (B)

$B$

$E=\frac{hc}{\lambda }$
Clearly, for shortest wavelength, maximum energy difference between the energy states, as shown in the figure, for B.