The decay constant of a radio active substance is $0.173\, (years)^{-1}.$ Therefore :
The decay constant of a radio active substance is $0.173\, (years)^{-1}.$ Therefore :
- A
Nearly $63\%$ of the radioactive substance will decay in $(1/0.173)\, year.$
- B
half life of the radio active substance is $(1/0.173) \,year.$
- C
one -forth of the radioactive substance will be left after nearly $8$ years.
- D
$(A)$ and $(C)$ both
Similar Questions
Two radioactive samples $A$ and $B$ have half lives $T_1$ and $T_2\left(T_1 > T_2\right)$ respectively At $t=0$, the activity of $B$ was twice the activity of $A$. Their activity will become equal after a time
Two radioactive samples $A$ and $B$ have half lives $T_1$ and $T_2\left(T_1 > T_2\right)$ respectively At $t=0$, the activity of $B$ was twice the activity of $A$. Their activity will become equal after a time
$37$ Rutherford equals
$37$ Rutherford equals
In a radioactive decay chain, ${ }_{90}^{232} Th$ nucleus decays to ${ }_{82}^{212} Pb$ nucleus. Let $N _\alpha$ and $N _\beta$ be the number of $\alpha$ and $\beta^{-}$particles, respectively, emitted in this decay process. Which of the following statements is (are) true?
$(A)$ $N _\alpha=5$ $(B)$ $N _\alpha=6$ $(C)$ $N _\beta=2$ $(D)$ $N _\beta=4$
In a radioactive decay chain, ${ }_{90}^{232} Th$ nucleus decays to ${ }_{82}^{212} Pb$ nucleus. Let $N _\alpha$ and $N _\beta$ be the number of $\alpha$ and $\beta^{-}$particles, respectively, emitted in this decay process. Which of the following statements is (are) true?
$(A)$ $N _\alpha=5$ $(B)$ $N _\alpha=6$ $(C)$ $N _\beta=2$ $(D)$ $N _\beta=4$
- [IIT 2018]
The $S.I.$ unit of radioactivity is
The $S.I.$ unit of radioactivity is
If half life of radium is $77$ days. Its decay constant in day will be
If half life of radium is $77$ days. Its decay constant in day will be