The power obtained in a reactor using U ²³⁵ disintegration is 1000 ~kW . The mass decay of U ²³⁵ per hour is

Step-by-step solution

Let assume power P=1000 ~W Energy per hour =1000 3600 ~J Energy per fission =200 MeV =200 1.6 10⁻¹³ ~J Number of fission per hour n= 1000 3600 200 1.6 10⁻¹³ aligned & Number of mole per hour = n N & Mass per hour = n N 235 aligned aligned & = 1000 3600 235 200 1.6 10⁻¹³ 6.02 10²³ & =43.9 10⁻⁶ ~g aligned This 43.9 10⁻⁶ ~g is nearest value of 40 micro gram so option (b) is correct.