Fast neutron therapy is used in modern medicine to treat cancer that is resistant to other methods of treatment. To produce the neutrons needed for fast neutron therapy, a stream
of protons is accelerated towards a mass of beryllium. This causes the beryllium atoms
to release neutrons from their nuclei.
The methods used to perform fast neutron therapy are an example of which type of
reaction?

m=9

step-by-step explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.