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3 years ago

If we decrease the size of a quantum dot that contains an electron, what happens to the energy levels?

1 answer:

6 0

We will solve this problem using the direct concept related to band gap energy, that is, a band gap is the distance between the valence band of electrons and the conduction band, i. e, the energy range in a solid where no electron states (Electronic state) can exist Mathematically can be described as,

$E_n = \frac{h^2n^2}{8mcR^2}$

Where,

h = Planck's constant

n = Energy level

mc = Effective mass of the point charge

R = Size of the particle

As you can see the energy is inversely proportional to the size of the particle:

$E_n \propto \frac{1}{R^2}$

Therefore if the size is decreased, the amount of energy is increased.

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The difference between the mass of the nucleus and the mass of the nucleons it contains is converted into ? that holds the nucle

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Mass defect is the difference of mass of neucleons and the mass of atom.

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3 years ago

A distant star gives off a visible range of light whose color depends on its temperature. Which model of light does this example

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3 years ago

How is urine produced

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Suppose you have a total charge qtot that you can split in any manner. Once split, the separation distance is fixed. How do you

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Answer:

Answer is explained in the explanation section below.

Explanation:

Solution:

We know from the Coulomb's Law that, Coulomb's force is directly proportional to the product of two charges q1 and q2 and inversely proportional to the square of the radius between them.

So,

F = $\frac{Kq1q2}{r^{2} }$

Now, we are asked to get the greatest force. So, in order to do that, product of the charges must be greatest because the force and product of charges are directly proportional.

Let's suppose, q1 = q

So,

if q1 = q

then

q2 = Q-q

Product of Charges = q1 x q2

Now, it is:

Product of Charges = q x (Q-q)

So,

Product of Charges = qQ - $q^{2}$

And the expression qQ - $q^{2}$ is clearly a quadratic expression. And clearly its roots are 0 and Q.

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4 years ago