A radioactive sample initially contains N atoms. After th...
A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is
\(\frac{N}{8}\)
\(\frac{3N}{8}\)
\(\frac{5N}{8}\)
\(\frac{7N}{8}\)
Correct answer is D
N \(\to\) \(\frac{N}{2}\) \(\to\) \(\frac{N}{4}\) \(\to\) \(\frac{N}{8}\)
Number of atoms left = 1-1/8=\(\frac{7N}{8}\)
Which of the following is TRUE of light and sound waves? ...
The silvered walls of a vacuum flask minimise loss of heat due to ...
The silvered surface in a vacuum flask reduces heat loos due to ...
The velocity y of a particle in a time t is given by the equation y = 10 + 2t2 Find the instantan...
An alternating current with a frequency of 100HZ has a period of ...