Calculate the macroscopic neutron absorption cross section at 0.0253 ev for UO2 enriched to 4.50 w/o U-235. The density of the UO2 is 10.5 g/cm Assume the UO2 is at 400 deg C which is close to fuel reactor temperatures.

i think it is true since you can test the answer and can use observations to complete it.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.