Questions in nuclei

Select	Question
	Which of the following statement is true
	What was the fissionable material used in bomb dropped at Nagasaki (Japan) in the year 1945 ?
	Thermal neutrons are those which
	In a fission process, nucleus A divides into two nuclei B and C, their binding energies being ${E_a},\;{E_b}$and ${E_c}$ respectively. Then
	A nuclear bomb exploded 200 km above the surface of moon. The sound of explosion on the moon
	Fast neutrons can easily be slowed down by
	The mass equivalent of 931 MeV energy is
	When $_{92}{U^{235}}$undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of $_{92}{U^{235}}$ undergoes fission
	$\gamma$ -rays radiation can be used to create electron-positron pair. In this process of pair production, $\gamma$ -rays energy cannot be less than
	A reaction between a proton and $_8{O^{18}}$that produces $_9{F^{18}}$must also liberate