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3 years ago

Why all goals cannot be met in economics?

1 answer:

muminat3 years ago

4 0

The in the very definition of 'economics' explains why. Since, economics is a social science that studies human behaviour, is a relationship *BETWEEN* ends and scarce means..
<span>
'ends' that is goals, and "scarce means" referred to the resources. So that is the economic problem, that there are *unlimited* wants but scarce resources. So the answer to this question is just: All goals cannot be reached because there are unlimited "goals", and few/limited resources.</span>

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One of the hazards of nuclear explosions is the generation of 90Sr andits subsequent incorporation in place of calcium in bones.

Illusion [34]

Explanation:

Initial mass of the isotope 90-Sr in baby= 1.00 μg

Formula used :

$N=N_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}$

where,

$N_o$ = initial mass of isotope

N = mass of the parent isotope left after the time, (t)

$t_{\frac{1}{2}}$ = half life of the isotope = 28.1 years

$\lambda$ = rate constant

$N=N_o\times e^{-(\frac{0.693}{t_{1/2}})\times t}$

a) Time taken by the sample, t = 18 years

$N=1.00 \mu g\times e^{-\frac{0.693}{28.1 years}\times 18 years}$

$N = 0.6415 \mu g$

0.6415 μg will remain after 18 years.

b) Time taken by the sample, t = 70 years

$N=1.00 \mu g\times e^{-\frac{0.693}{28.1 years}\times 70 years}$

$N = 0.1779\mu g$

0.1779 μg will remain after 70 years.

3 0

4 years ago

Specify the l and ml values for n = 4.

Bumek [7]

Answer : The specify the l and ml values for n = 4 are:

At l = 0, $m_l=0$

At l = 1, $m_l=+1,0,-1$

At l = 2, $m_l=+2,+1,0,-1,-2$

At l = 3, $m_l=+3,+2,+1,0,-1,-2,-3$

Explanation:

There are 4 quantum numbers :

Principle Quantum Numbers : It describes the size of the orbital. It is represented by n. n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as m_l. The value of this quantum number ranges from $(-l\text{ to }+l)$ . When l = 2, the value of $m_l$ will be -2, -1, 0, +1, +2.

Spin Quantum number : It describes the direction of electron spin. This is represented as $m_s$ The value of this is $+\frac{1}{2}$ for upward spin and $-\frac{1}{2}$ for downward spin.

As we are given, n = 4 then the value of l and ml are,

l = 0, 1, 2, 3

At l = 0, $m_l=0$

At l = 1, $m_l=+1,0,-1$

At l = 2, $m_l=+2,+1,0,-1,-2$

At l = 3, $m_l=+3,+2,+1,0,-1,-2,-3$

6 0

3 years ago

Consider the reaction for the dissolution of solid magnesium hydroxide.

sp2606 [1]

Answer:

Molar solubility is 1.12x10⁻⁴M

Explanation:

The dissolution of magnesium hydroxide is:

Mg(OH)₂(s) ⇄ Mg²⁺ + 2OH⁻

The molar solubility represents the moles of the solid that the solution can dissolve, that could be written as:

Mg(OH)₂(s) ⇄ X + 2X

<em>Where X is solubility.</em>

<em />

If you obtained a [OH⁻] = 2.24x10⁻⁴M and you know [OH⁻] = 2X:

2X = 2.24x10⁻⁴M

X = 2.24x10⁻⁴M/2

X =1.12x10⁻⁴M

<h3>Molar solubility is 1.12x10⁻⁴M</h3>

4 0

3 years ago

What trends become apparent from the arrangement of electrons in the periodic table

monitta

Answer:

TIK TOK

Explanation:

6 0

3 years ago

Read 2 more answers

As water freezes ______. as water freezes ______. its hydrogen bonds break apart its molecules move farther apart it cools the s

scoray [572]

As water freezes its molecules move farther apart. As when water freezes , Its move farther apart .

And the cause of this movement is hydrogen bond that is formed among the surrounding water molecules that causes water molecules to move apart. So as water freezes its molecules move farther apart, it is the correct answer .

5 0

4 years ago

Read 2 more answers