Potassium is a crucial element for the healthy operation of the
human body. Potassium occurs naturally in our environment (and
thus our bodies) as three isotopes: Potassium – 39, Potassium – 40
and Potassium – 41. Their current abundances are 93.26%, 0.012%
and 6.728%. A typical human body contains about 3.0 grams of
potassium per kilogram of body mass.
1. How much Potassium – 40 is present in a person with a mass of
80 kg?
2. If, on average, the decay of Potassium – 40 results in 1.10 MeV
of energy absorbed, determine the effective dose (in Sieverts)
per year due to Potassium – 40 in an 80 kg body. Assume an
RBE of 1.2. The half-life of Potassium – 40 is 1.28 x 109 years.

its a cold cold word

Explanation:

its a wild wild life

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.