Question

One require 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiations to achieve the dissociation lies in

• A. Visible region.
• B. Infrared region.
• C. Ultraviolet region.
• D. Microwave region

Answer 1

Answer: (C)

Ultraviolet region.

Answer 2

: Here, $E = 11eV = 11 \times 1.6 \times 10^{- 19}J = h\upsilon$

$\therefore\upsilon = \frac{11 \times 1.6 \times 10^{- 19}}{h}$

$E_{0} \propto \frac{1}{r}.$ $= \frac{11 \times 1.6 \times 10^{- 19}}{6.62 \times 10^{- 34}} = 2.6 \times 10^{15}Hz$

This frequency belongs to ultraviolet region.