Answer:
The move from Level n=3 to Level n=2 has the long wavelength.
Explanation:
First, due to the selection rules, only transitions between adjacent levels are allowed, thus, only a transition between Level n=3 to Level n=2 or Level n=5 to Level n=4 are allowed. The two first options are wrong.
Second, analyzing the transition between Level n=3 to Level n=2 and the transition between Level n=5 to Level n=4 it is necessary to think in terms of the equation of the difference of energy for these type of transitions:
Δ (1)
The difference in energy (ΔE) is directly proportional to the quadratic difference between the 'n' levels of transition. Therefore, If the transition occurs between smaller 'n' levels the difference of energy will be smaller too.
Also, the energy (ΔE) is inversely proportional to the wavelength (λ) so a smaller energy means a larger wavelength.
ΔE = c / λ (2)
Hence, the move from Level n=3 to Level n=2 has a long wavelength.
In order to calculate this wavelength is necessary to replace the data on equation (1) and (2).
Answer:
<h2>
CO² + H²O ---------). H²CO³</h2>
answer is this. all the numbers above alphabet will be bellow. while writing remember
Explanation:
CO² mean Carbon dioxide
H2O mean Water
H²CO³ mean Carbonic acid
Carbon dioxide+H²O = Carbonic acid
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The answer is A) Water has surface tension.
This is the correct answer because water allows animals and really light items to rest upon the top of the water.
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<h3><u>Answer;</u></h3>
N₂(g) + 2O₂(g) → 2NO₂(g).
<h3><u>Explanation;</u></h3>
- <em><u>Photo-chemical smog is a type of air pollution that results from the reaction of solar radiation with airborne pollutant mixtures of nitrogen oxides (NOx) and volatile organic compounds (hydrocarbons).</u></em>
- Formation of photochemical smog involves a couple of chemical reactions which includes;
<em>N2 + O2 → 2NO </em>
<em>2NO + O2 → 2NO2</em>
<em>NO2 → NO +O </em>
<em>O + O2 → O3 </em>
<em>O3 + NO ⇆ NO2 + O2 </em>
Combining all the reactions we obtain an overall reaction;
N₂(g) + 2O₂(g) → 2NO₂(g).
Answer:
The type of allergy test is scratch test.
Explanation:
In a scratch test also called a skin pri c k test or puncture test, an allergy provoking substance placed on the skin is gradually scratched into the skin surface with the aid of a needle or lancet so as to detect bodily reactions to allergens. Some of the types allergens whose reactions are generally tested for include pollen, dust mites, molds and foods.
The scratch test takes about 5 to 10 minutes and it could cause slight pain and the may result in itching feeling at the location where the allergen was introduced.