The answer to your question is a 12
The atomic number represents the number of protons present in an atom.Therefore,the answer is B.
Explanation:
The given data is as follows.
,
Area of the flat plate is 2 × 4 = 8 .
Average convection heat transfer coefficient = = .
Hence, formula to calculate heat transfer through convection from air to the water is given as follows.
q =
=
= 24000 W
or, = 24 kW
Hence, the direction of heat flow is from air to the surface.
Thus, we can conclude that transfer of heat is 24 kW.
Atomic number of an element is the number of protons present in that element. It is unique for each element. The atomic number of carbon is 6.
The time taken for Hydrogen-3 to decay from 88 g to 11 g is 36.9 years.
<h3>Half-life:</h3>
This can be defined as the time taken for half the sample of a substance to decay or disintegrate
To calculate the time it will take Hydrogen to decay from 88g to 11 g we use the formula below.
Formula:
- R = R'()................ Equation 1
Where:
- R = Original sample of Hydrogen
- R' = Sample of Hydrogen left after decay
- T = Total time of decay
- n = Half-life of hydrogen.
From the question,
Given:
- R = 88 g
- R' = 11 g
- n = 12.3 years.
Substitute these values into equation 1
- 88 = 11()
Solve for T.
- = 88/11
- = 8
- = 2³................ Equation 2
Equating the base in equation 2 above,
- T/12.3 = 3
- T = 12.3×3
- T = 36.9 years.
Hence, the time taken for Hydrogen-3 to decay from 88 g to 11 g is 36.9 years
Learn more about half-life here: brainly.com/question/11152793