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tigry1 [53]
3 years ago
11

6th grade science help me if you can c:

Chemistry
1 answer:
lesya [120]3 years ago
4 0
B. Troposphere, stratosphere, mesosphere, thermosphere
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What is the principal reason we must consider the uncertainty principle when discussing electrons and other subatomic particles
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Here is the correct answer of the given question above. The principal reason that we must consider the uncertainty principle when discussing electrons and other subatomic particles, but not when discussing our macroscopic world is that photons of only certain allowed frequencies can be absorbed or emitted as the electron changes energy state. Hope this answer helps.
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Hydrogen atoms absorb energy so that the electrons are excited to n=4. Calculate the wavelength, in
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Answer:

the wavelength, in nm, of the photon is 487.5 nm

Explanation:

Given:

n = 4 (excited)

n = 2 (relaxes)

Question: Calculate the wavelength, in nm, λ = ?

First, it is important to calculate the energy of the electron when it excited and then when it relaxes.

E_{1} =\frac{-13.6}{n^{2} } =\frac{-13.6}{4^{2} } =-0.85eV (excited)

E_{2} =\frac{-13.6}{2^{2} } =-3.4eV (relaxes)

The change of energy

ΔE = E₁ - E₂=-0.85 - (-3.4) = 2.55 eV = 4.08x10⁻¹⁹J

For a photon, the wavelength emitted

\lambda =\frac{hc}{delta(E)}

Here

h = Planck's constant = 6.63x10⁻³⁴J s

c = speed of light = 3x10⁸m/s

Substituting values:

\lambda =\frac{6.63x10^{-34}*3x10^{8}  }{4.08x10^{-19} } =4.875x10^{-7} m=487.5nm

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