$1\, Curie $ is equal to
$3 \times {10^{10}}\,\, disintegrations/sec$
$3.7 \times {10^7}\,\, disintegrations/sec$
$5 \times {10^7}\,\, disintegrations/sec$
$3.7 \times {10^{10}}\,\, disintegrations/sec$
A radioactive element has half life period $800$ years. After $6400$ years what amount will remain?
State the relation between average life and decay constant.
Half-lives of two radioactive elements $A$ and $B$ are $20$ minutes and $40$ minutes, respectively. Initially, the samples have equal number of nuclei. After $80$ minutes, the ratio of decayed number of $A$ and $B$ nuclei will be
The disintegration rate of a certain radioactive sample at any instant is $4250$ disintegrations per minute.$10$ minutes later, the rate becomes $2250$ disintegrations per minute. The approximate decay cons $.........\min^{-1}$
If the radioactive decay constant of radium is $1.07 \times {10^{ - 4}}$ per year, then its half life period is approximately equal to .........$years$