`Na""^(22)` has half life of 2.68 years. It decays both by positron emission and electron capture with a ratio of 86% of the former to 14% of the later. The half life for positron emission in years (nearly) is

`Na""^(22)` has half life of 2.68 years. It decays both by positron em

1.	`Na""^(22)` has half life of 2.68 years. It decays both by positron emission and electron capture with a ratio of 86% of the former to 14% of the later. The half life for positron emission in years (nearly) is
Answer» Correct Answer - 3 `lamda""_(1)/lamda""_(2)=14/86,(lamda=2.303/tlog"N""_(0)/N),` `lamda=lamda""_(1)+lamda""_(2)` `0.693/2.68=(lamda""_(2)xx14)/86+lamda""_(2)02` `0.258=lamda""_(2)(14/86+1)` `0.258=lamda""_(2)(100/86)` lamda""_(2)=(86xx0.258)/(100),t""_(1//2)=0.693/lamda""_(2)`

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During the transformation of `._(c )X^(a)` to `._(d)Y^(b)` the number of `beta`-particles emitted are a. `d + ((a - b)/(2)) - c` b. `(a - b)/(c )` c. `d + ((a - b)/(2)) + c` d. `2c - d + a = b`A. a. `d + ((a - b)/(2)) - c`B. b. `(a - b)/(c )`C. c. `d + ((a - b)/(2)) + c`D. d. `2c - d + a = b`
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`Na""^(22)` has half life of 2.68 years. It decays both by positron emission and electron capture with a ratio of 86% of the former to 14% of the later. The half life for positron emission in years (nearly) is

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