Correct Answer: C. afforestation

Correct Answer: A. re-opened

Correct Answer: B. 10

Explanation

6, p, 14

14 - p = p - 6

14 + 6 = p - 6

14 + 6 = p + p

\(\frac{2p}{2}\)

= \(\frac{20}{2}\)

p = 10

Correct Answer: A. man possessed of demons

Correct Answer: A. furniture making

Correct Answer: D. Phosphorus

Explanation

(a)(i) Mass defect is the difference between the mass of a nucleus and the total mass of its nucleons. It expressed in atomic mass unit (a.m.u.). It is also a measure of binding energy.

Mass defect = total mass of nucleus

– mass of nucleons.

(ii) Binding energy is the work done or energy needed to separate the nucleons in a nucleus. It is measured in eV or Joules (J).

(b)(i) The effect of decreasing the speed of a photoelectron on: (\(\alpha\)) wavelength --> wavelength increases. (\(\beta\)) energy ---> energy decreases.

(ii) \(\lambda = \frac{h}{mv}\)

= \(\frac{6.6 \times 10^{-34}}{4.4 \times 10^{-2} \times 10^{-16}}\)m

(c) Pairs of isotopes in the figure are;

\(^{208}_{82}Pb\) and \(^{212}_{82}Pb\) or \(^{212}_{84}Po\) and \(^{216}_{84}Po\) or

\(^{224}_{88}Ra\) and \(^{288}_{88}Ra\) or \(^{288}_{90}Th\) and \(^{232}_{90}Th\)

(ii) The series started with isotopes \(^{232}_{90}Th\)

(iii) Nuclear equation for;

\(\alpha\)Alpha decay

\(^{232}_{90}Th\) \(\to\) \(^{228}_{88}Ra\) + \(^{4}_{2}He\) + Energy;

\(^{228}_{90}Th\) \(\to\) \(^{22}_{88}Ra\) + \(^{4}_{2}He\) + Energy;

\(^{224}_{88}Ra\) \(\to\) \(^{220}_{86}Rn\) + \(^{4}_{2}He\) + Energy;

\(^{212}_{84}Po\) \(\to\) \(^{208}_{82}Pb\) + \(^{4}_{2}He\) + Energy;

\(^{216}_{84}Po\) \(\to\) \(^{212}_{82}Pb\) + \(^{4}_{2}He\) + Energy;

\(^{212}_{84}Rn\) \(\to\) \(^{208}_{82}Po\) + \(^{4}_{2}He\) + Energy;

\(^{220}_{84}Rn\) \(\to\) \(^{216}_{84}Po\) + \(^{4}_{2}He\) + Energy;

\(^{216}_{84}Rn\) \(\to\) \(^{212}_{82}Pb\) + \(^{4}_{2}He\) + Energy;

(\(\beta\)) Beta decay

\(^{224}_{88}Ra\) \(\to\) \(^{224}_{89}Ac\) + \(^{o}_{-1}e\) + Energy;

\(^{228}_{88}Ac\) \(\to\) \(^{228}_{90}Ac\) + \(^{o}_{-1}e\) + Energy;

\(^{212}_{82}Pb\) \(\to\) \(^{212}_{83}Bi\) + \(^{o}_{-1}e\) + Energy;

\(^{212}_{83}Ra\) \(\to\) \(^{212}_{84}Ac\) + \(^{o}_{-1}e\) + Energy;

Correct Answer: C. 00100101.

Correct Answer: D. Anemometer

Correct Answer: C) It will break even

Explanation

This question is asking about what a firm needs to do in order to maximize its total profits. The options are: A) total revenue equals total cost, B) total cost exceeds total revenue by the greatest amount, C) it will break even, and D) it is at the break-even point.

The correct answer is C) it will break even. This means that a firm will make the most profit when its total revenue equals its total cost. When a firm is at the break-even point, it is not making a profit or a loss, but it is covering all of its costs.

It is important for a firm to consider its costs when making decisions about how much to produce and how much to charge for its products. If a firm charges too little for its products, it may not be able to cover its costs, and it will lose money. If a firm charges too much for its products, it may not sell enough to make a profit.

Therefore, a firm needs to find the sweet spot where it can charge a price that covers its costs while also selling enough products to make a profit. This is where the firm will maximize its total profits.

To learn more and verify this, please read the relevant sections of the recommended textbooks.