In 90 seconds, the mass of a radioactive element reduces ...
In 90 seconds, the mass of a radioactive element reduces to 116 of its original value. Determine the half- life of the element.
15.0s
18.0s
22.5s
30.0s
45.0s
Correct answer is C
116=(12)n
(12)4=(12)n
n=4
90 secs = 4 half lives
1 half life = 904 secs
= 22.5 secs
Calculate the peak voltage that could be obtained from a 220 Vr.m.smain supply....
A perfect emitter or absorber of radiant energy is a ...
In the diagram above, which of the angles θ1 , θ2 , θ3 and \(...
The charge of an alpha particle can be neutralized by ...
A mixture of blue and red pigment when illuminated by white light will appear ...