$\Rightarrow \mathrm{p}=\frac{\mathrm{h}}{\lambda}$
$\Rightarrow \frac{6.6 \times 10^{-34}}{6630 \times 10^{-10}}=9.95 \times 10^{-28} \,\mathrm{kg} \,\mathrm{m} /\, \mathrm{sec}$
$=1 \times 10^{-27}\, \mathrm{kg}\, \mathrm{m} /\, \mathrm{sec}$
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The correct structure of
$(a)\ Pb^{+2} > Pb^{+4} , Tl^{+1} < Tl^{+3}$
$(b)\ Bi^{+3} < Sb^{+3 }, Sn^{+2} < Sn^{+4}$
$(c)\ Pb^{+2} > Pb^{+4} , Bi^{+3} > Bi^{+5}$
$(d)\ Tl^{+3} < In^{+3} , Sn^{+2} > Sn^{+4}$
$(e)\ Sn^{+24} < Pb^{+2} , Sn^{+4} > Pb^{+4}$
$(f)\ Sn^{+2} < Pb^{+2} , Sn^{+4} < Pb^{+4}$
