A radioactive substance has a half life of 20 days. What ...
A radioactive substance has a half life of 20 days. What fraction of the original radioactive nuclei will remain after 80 days?
\( \frac{1}{32} \)
\( \frac{1}{16} \)
\( \frac{1}{8} \)
\( \frac{1}{4} \)
Correct answer is B
80 days = 4 half lives (i.e 4 x 20dqs = 80dq)
But the fraction always left by any radioactive material after 4 half lives is
\( \left ( \frac{1}{2} \right)^4 = \frac{1}{16} \)
As a bicycle Tyre was being pumped up, it was noticed that contrary to Boyle's law the volume in...
Which of the current-voltage characteristics shown below is that exhibited an ohmic conductor? ...
The graph above shows the expansion of water as the temperature increases from 0°C. Which of the...