Choose the correct option
(a) Atom bomb is based on nucleus fission (uncontrolled chain reaction)used as fissionable substance. In the exposion, a temperature of the order of `10^(6).^(@)C` and a pressure of lacs of atomspheres is obtained
(ii) In nuclear reactor, by controlled chain reaction a huge enegry is obtained for useful purpose
(iii) In a reactor fuel is `U^(234)` or `Pu^(238)`
(iv) Moderators (Light water, heavy water, graphite, Cadmium rods are used as safety rods

Options

A. `(i),(ii),(iii)`
B. `(i),(ii),(iv)`
C. `(ii),(iii),(iv)`
D. all

Answer

D