Question

Which of the following transitions have minimum wavelengths?

• A. $ {{n}_{4}}\to {{n}_{1}} $
• B. $ {{n}_{2}}\to {{n}_{1}} $
• C. $ {{n}_{4}}\to {{n}_{2}} $
• D. $ {{n}_{3}}\to {{n}_{1}} $

Answer 1

Answer: (A)

$ E=\frac{hc}{\lambda } $ or $ E\propto \frac{1}{\lambda } $ Thus a decrease in wave length represents an increase in energy For $ {{n}_{4}}\xrightarrow{{}}{{n}_{1}}, $ transition. These are greater the energy difference and lesser will be wavelength. Thus, for $ {{n}_{4}}\xrightarrow{{}}{{n}_{1}} $ transition has minimum wavelength