If the fraction of the atoms of a radioactive material le...
If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?
24 years
20 years
10 years
2 years
Correct answer is B
Given amount remaining = 164
= 164=1(2)6
∴ = \frac{120 \text {years}}{6} = 20 years
\Rightarrow T\frac{1}{2} = 20 years
Radio waves belongs to the class of waves whose velocity is about ...
A ball is swung in a horizontal circle of centre O with a constant speed. acceleration? ...
A reservoir is filled with liquid of density 2000 kgm^{-1}. Calculate the depth at which the pre...
The silvered walls of a vacuum flask minimise loss of heat due to ...
Which of the following statements about radioactivity are true? i. alpha particle is positively c...