Ncert Exercises & Solutions

One requires \(11\) eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in:
1. visible region
2. infrared region
3. ultraviolet region
4. microwave region

Step 1: Given, energy required to dissociate a carbon monoxide molecule into carbon and oxygen atoms,

E = 11eV

We know that, E = h

ν

, where h = 6.62 x

10^{- 34}

J-sec

v = frequency

\Rightarrow

11eV = h

ν

\Rightarrow

ν = \frac{11 \times 1.6 \times 10^{- 19}}{h} J

= \frac{11 \times 1.6 \times 10^{- 19}}{6.62 \times 10^{- 34}} J

= 2.65 \times 10^{15} Hz

This frequency radiation belongs to the ultraviolet region.

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