a candle is placed between a concave mirror and its focal point which two of the following best describe the image
1 answer:
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D. Same energy level but different sublevel.
<h3>Explanation</h3>There are four quantum numbers [1]:
- <em>n</em><em>, </em>the principal quantum number,
- <em>l</em>, the orbital angular momentum quantum number,
- <em>
</em>, the magnetic quantum number, and
- <em>
</em>, the electron spin quantum number.
As their names might suggest:
- <em>n </em>determines the main energy level of an electron.
- <em>l</em> determines the type of sublevel of an electron.
- Each sublevel might contain more than one orbital. <em>
- Each orbital contains up to two electrons. <em>
The two electrons in question come from the same atom. The question suggests that they have the same <em>n</em>, <em></em>, and <em>
</em>. As a result, both electrons are in main energy level <em>n</em> = 3. They share the same spin.
However, the two electrons differ in their value of <em>l</em>.
- <em>l </em>= 2 for the first electron. It belongs to a <em>d</em> sublevel.
- <em>l </em>= 1 for the second electron. It belongs to a <em>p</em> sublevel.
[1] Kamenko, Anastasiya, et. al, "Quantum Numbers", Physical & Theoretical Chemistry, Chemistry Libretexts, 24 Mar 2017.
The answer is- Mass of flask = 608.04 g
Density (d) is defined as mass of substance divided by its volume. Thus, if mass and density are known, then Volume can be determined.
What is the formula of mass in terms of density?
- Let mass of substance be 'm' and volume be 'V'. Thus, as per the definition of density, it is expressed as-
Thus, mass can be expressed as-
- Now, mass of empty flask = 241.3 g and the mass of (flask + Water) = 489.1 g.
Thus, mass of water = .
- Thus, mass of water = 247.8 g and density of water =
. Its volume is calculated as-
- Volume of flask = 247.8
.
- Then when this flask is filled with chloroform (d =
), the mass of chloroform is-
- Hence, the mass of flask becomes =
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