MCQ
The momentum (in $kg-m/s$ ) of photon having $6\,\,MeV$ energy is
- ✓$3.2 \times 10^{-21}$
- B$2.0$
- C$1.6 \times 10^{-21}$
- D$3.2 \times 10^{-18}$
$E=\frac{h c}{\lambda}$
$\lambda =\frac{h}{P}$
$p =\frac{h}{\lambda}=\frac{E}{C}$
$=\frac{26 \times 10^6 \times 1.6 \times 10^{-13}}{3 \times 10^7}$
$=3.2 \times 10^{-21}$
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$O\left( g \right) + {e^ - } \to O_{\left( g \right)}^ - \,\,\,\,;\,\,\,\,{\Delta _f}{H^\Theta } = - 141\,kJ\,mo{l^{ - 1}}$
${O^ - }\left( g \right) + {e^ - } \to O_{\left( g \right)}^{2 - }\,\,\,\,;\,\,\,\,{\Delta _f}{H^\Theta } = + 780\,kJ\,mo{l^{ - 1}}$
Thus process of formation of $O_2^-$ in gas phase is unfavourable even thought $O_2^-$ is isoelectronic with neon. It is due to the fact that,