I think you meant to say "procedure" instead of "produced".
Choice B is the answer as it is the safest and most sensible (to prevent damage to clothing or start a fire for example). The other choices are nonsensical or silly.
To solve this problem we will use the concept related to electrons in a box which determines the energy of an electron in that state.
Mathematically this expression is given by,
![E_n= \frac{n^2h^2}{8mL^2}](https://tex.z-dn.net/?f=E_n%3D%20%5Cfrac%7Bn%5E2h%5E2%7D%7B8mL%5E2%7D)
Where,
m = mass of an electron
h = Planck's constant
n = is the integer number of the eigenstate
L = Quantum well width
The change in energy must be given in state 1 and 2, therefore
![\Delta E = E_2 - E_1](https://tex.z-dn.net/?f=%5CDelta%20E%20%3D%20E_2%20-%20E_1)
![\Delta E = \frac{2^2h^2}{8mL^2}-\frac{1^2h^2}{8mL^2}](https://tex.z-dn.net/?f=%5CDelta%20E%20%3D%20%5Cfrac%7B2%5E2h%5E2%7D%7B8mL%5E2%7D-%5Cfrac%7B1%5E2h%5E2%7D%7B8mL%5E2%7D)
![\Delta E = \frac{3h^2}{8mL^2}](https://tex.z-dn.net/?f=%5CDelta%20E%20%3D%20%5Cfrac%7B3h%5E2%7D%7B8mL%5E2%7D)
Replacing we have:
![(4*1.6*10^{-19}) = \frac{3(6.626*10^{34})}{8*(9.11*10^{-31})*L^2}](https://tex.z-dn.net/?f=%284%2A1.6%2A10%5E%7B-19%7D%29%20%3D%20%5Cfrac%7B3%286.626%2A10%5E%7B34%7D%29%7D%7B8%2A%289.11%2A10%5E%7B-31%7D%29%2AL%5E2%7D)
![L = 0.53nm](https://tex.z-dn.net/?f=L%20%3D%200.53nm)
Therefore the correct answer is C.
True, due to the amount of children being born is greater than that of people dying
Given: Mass m = 400 Kg; Height h = 3 m; g = 10 m/s²
Required: Work = ?
Formula: Work = Force x distance F = ma a = g F = mg
W = fd
W = mgh
W = (400 Kg)(10 m/s²)( 3 m)
W = 12,000 Kg.m²/s²
W = 12,000 J