Question

Critical mass

Question 1 options:

	is the minimum mass required to sustain a chain reaction.
	is dependent upon both the amount of material and the surface area of the material.
	can be reduced by surrounding the material with a neutron reflector.
	all of the above.
	None of the above.

Question 2 (1 point)

For a fission reaction to spontaneously take place

Question 2 options:

	the mass of the daughter nuclei must be smaller than the mass of the original nucleus.
	the mass of the daughter nuclei must be larger than the mass of the original nucleus.
	the mass of the daughter nuclei must be exactly the same as the mass of the original nucleus.
	can be any of the above.
	I don't know.

Question 3 (1 point)

For a fusion reaction to spontaneously take place

Question 3 options:

	the mass of the daughter nucleus must be smaller than the sum of the masses of the original nuclei.
	the mass of the daughter nucleus must be larger than the sum of the masses of the original nuclei.
	the mass of the daughter nucleus must be the same as the sum of the masses of the original nuclei.
	can be any of the above.
	I don't know.

Question 4 (1 point)

Natural nuclear reactions are known to occur

Question 4 options:

	in stars.
	underground in earth.
	on a tabletop as cold fusion.
	both a and b
	both a and c

Question 5 (1 point)

The reason radiological dispersion devices are a main terrorism concern is that

Question 5 options:

	extensive bomb design is not necessary - traditional explosives are used to disperse radioactive material.
	such devices could be smaller than a backpack and therefore very hard to detect.
	they do not require significant amounts of radioactive material and could be constructed furtively, outside of the purview of those monitoring radioactive material trafficking.
	both a and b.
	all of the above.

Answer 1

to sustain density Critical mass is minimum mass required a chain reaction and also depends on shape and purity so Call of the abone / 0 for fission than mass of parents daughtes nuclee. nuclei is less - Mass of parents nuclee must be greater than daughtes ncler to release energy . Q-4 Nuclear reaction takes place in stars.

Thanks for asking.