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sertanlavr [38]
3 years ago
8

What will happen when substances go through chemical changes

Chemistry
1 answer:
DanielleElmas [232]3 years ago
6 0
When going through a chemical change, the substance will never return to its original place.
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Does the element have a different amount of electrons than protons?
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How many photons are produced in a laser pulse of 0.862 J at 691 nm?
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To calculate how many photons are in a certain amount of energy (joules) we need to know how much energy is in one photon.
Start by using two equations:
Energy of a photon = Frequency * Planck's constant (6.626 * 10^(-34) J-s)
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Which means:
frequency = Speed of Light / Wavelength
So energy of a photon = (Speed of light * Planck's constant)/(Wavelength)
You may have seen this equation as E = hc/<span>λ</span>
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So we can plug in all of our knowns:
E = (6.626 * 10^(-34) J-s) * (3.00 * 10^8 m/s) / (691 * 10^-9 m) = 
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,so divide joules by joules per photon, and we have the number of photons:
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3 years ago
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7 0
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