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mr Goodwill [35]
3 years ago
10

Which best explains why the noble gases are chemically unreactive? They have no valence electrons. They have the same number of

protons and electrons. They have more neutrons than protons. They have very stable outer electron shells.
Physics
2 answers:
miskamm [114]3 years ago
8 0
They have very stable outer electron shells

Alex777 [14]3 years ago
4 0
They have very stable outer electron shells
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explain how electrically neutral objects can become electrically charged even though charge cannot be created or destroyed
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Answer:

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Explanation:

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A laser pulse of duration 25 ms has a total energy of 1.4 J. The wavelength of this radiation is
SpyIntel [72]

Answer:

n = 4 x 10¹⁸ photons

Explanation:

First, we will calculate the energy of one photon in the radiation:

E = \frac{hc}{\lambda}\\\\

where,

E = Energy of one photon = ?

h = Plank's Constant = 6.625 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength of radiation = 567 nm = 5.67 x 10⁻⁷ m

Therefore,

E = \frac{(6.625\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{5.67\ x\ 10^{-7}\ m}

E = 3.505 x 10⁻¹⁹ J

Now, the number of photons to make up the total energy can be calculated as follows:

Total\ Energy = nE\\1.4\ J = n(3.505\ x\ 10^{-19}\ J)\\n = \frac{1.4\ J}{3.505\ x\ 10^{-19}\ J}\\

<u>n = 4 x 10¹⁸ photons</u>

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3 years ago
During nuclear decay, a new isotope is created. How is the nucleus of the new isotope different from the parent if the parent is
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Answer:

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Which one of the following statements indicates the result of Kepler's astronomical calculations?
garri49 [273]
The correct answer for the question that is being presented above is this one: "<span>c. Planets orbit in elliptical patterns; a planet's orbit covers equal areas in equal amounts of time; planets' orbits are shorter or longer depending on their distance from the Sun."</span>

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3 years ago
Please help me with this
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