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rosijanka [135]
3 years ago
5

Which of the following represents the total amount of energy emitted from a celestial object? Absolute brightness Apparent magni

tude Nebula Proto-star
Biology
2 answers:
joja [24]3 years ago
8 0

Absolute Brightness

Absolute brightness represents the total amount of energy emitted from a celestial object. It is the measure of the true brightness of a star or other celestial object as it would be as seen from a standard distance<span> of exactly 10 parsecs (32.6 light-yea</span>rs). The more luminous an object, the smaller the numerical value of its absolute magnitude or brightness.







ira [324]3 years ago
8 0

Answer: Absolute brightness

Explanation: I took The test

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. How many electrons are in the n = 2 shell of the oxygen atom before bonding? eight electrons 2. What is the maximum number of
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Answers

1. 8 electrons

2. 10 electrons

3. 10 electrons

4. 8 from the oxygen atom and 1 from each of the 2 hydrogen atoms

5. 4 hydrogen bonds

Explanation

The atomic number of oxygen is 8 thus it has a total of 8 electrons. When writing the electron configuration for the oxygen, the first n shell requires two electrons to complete the 1st orbital. The fact that 1s holds a maximum of 2 electrons the next 2 electrons of oxygen goes to 2s orbital. The 2s orbital takes a maximum of two electrons and the remaining 4 electrons occupy the 2p orbital. The configuration formed will be 1s² 2s² 2p4 .The maximum number of electrons in the second shell is 2n²=2×2² =8 from the formula 2n² (the maximum number of electrons in a shell). The total number of electrons in the second shell is 2(in s orbital) +4 (in p orbital) =6.The number of unpaired electrons is 8-6=2

A water molecule has four hydrogen bonds, because it is made up of two hydrogen atoms and an oxygen atom. A water molecule has 10 protons and 10 electrons thus it is neutral. In the water molecule there is formation of covalent bonds where oxygen atom and hydrogen atoms share electrons though the sharing is not equal. In the covalent bond, the oxygen atoms attract electrons more than the hydrogen atoms.


7 0
3 years ago
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Sickle cell disease is caused by a:
Tanzania [10]
I think the correct answer from the choices listed above is option A. Sickle cell disease is caused by a change in allele. It is a disorder of the blood caused by an inherited abnormal hemoglobin. Hope this answers the question. Have a nice day.
5 0
3 years ago
How does water rise in tall trees
Debora [2.8K]

Answer:

Answer: Water rise to tall trees by suction pull during day it is low but during night time it is fast. during night time transpiration is fast and transpiration create a pressure also called transpirational pull which cause root water to move at leaves.

Explanation:

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Answer:

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Explanation:

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But another protein named as effector may restrict activator from binding to the enhancer leading to a decrease in transcriptional expression by binding to the activator allosterically. Allosteric binding of effector to the activator causes conformational change in activator so it can no longer bind the enhancer.

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I need help on this biology question
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