Given the formula to prove: ΔE文=a4As2[(∇αx)2+(∇αy)2+(∇αz)2]
step 2
Identify the components of the formula: ΔE文 represents the change in energy, A and s are constants, a is a constant, and ∇αx,∇αy,∇αz are the gradients in the x, y, and z directions respectively
step 3
The formula can be broken down into parts: a4As2 is a constant multiplier, and [(∇αx)2+(∇αy)2+(∇αz)2] represents the sum of the squares of the gradients
step 4
To prove the formula, we need to show that the given expression correctly represents the change in energy ΔE文. This involves verifying that the constants and the sum of the squares of the gradients are correctly combined
step 5
The gradients ∇αx,∇αy,∇αz are partial derivatives with respect to the variables αx,αy,αz. The sum of their squares represents the total gradient magnitude in three-dimensional space
step 6
The constant a4As2 scales the total gradient magnitude to match the change in energy ΔE文
step 7
Therefore, the given formula ΔE文=a4As2[(∇αx)2+(∇αy)2+(∇αz)2] correctly represents the change in energy in terms of the gradients and the constants
Answer
The formula is correctly proven as ΔE文=a4As2[(∇αx)2+(∇αy)2+(∇αz)2].
Key Concept
Gradient Magnitude and Energy Change
Explanation
The formula represents the change in energy as a function of the gradients in three-dimensional space, scaled by a constant factor.
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