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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