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Sphinxa [80]
3 years ago
12

__________ is the gradual increase in the temperature of earth’s atmosphere. greenhouse effect air pollution global warming temp

erature inversion
Physics
2 answers:
tamaranim1 [39]3 years ago
8 0
Global warming would be the one 
irina [24]3 years ago
5 0

Answer: <u>Global Warming </u>is the gradual increase in the temperature of earth’s atmosphere.

Explanation:

Due to presence of atmosphere on Earth, the sun radiations are trapped in the lower atmosphere. This rises the temperature of the Earth gradually. This has led to a habitable temperature of the Earth.

With increase in green house gases in the atmosphere recently, more heat is being trapped leading to rise in average temperature of Earth. This is known as Global warming.

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Mass of Sun
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Percentage of mass converted to energy = 99.9 %

Explanation:

By far most of the solar system's mass is in the Sun itself: somewhere between 99.8 and 99.9 percent. The rest is split between the planets and their satellites, and the comets and asteroids and the dust and gas surrounding our star. Seen from afar (on the scale of distances between stars) the presence of the solar system would not be obvious. We would simply see a normal-looking star. Perhaps we would pick up the presence of Jupiter, which makes up two thirds or so of the solar system outside of the Sun, by mass.

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3 years ago
Explain concept of donor levels and accepter levels in extrinsic semiconductors and How can Fermi level be defined for conductor
nika2105 [10]

Answer:

DONORS: If the material for which it substitutes has more electrons than the original

ACCEPTORS: If the replacement material has fewer electrons than the original material

Fermi level: the point where the probability of finding the last electron is ½

Explanation:

When in a semiconductor material a small fraction of an element is replaced by another with different valences, an excess charge is created.

If the material for which it substitutes has more electrons than the original, there is an excess of electrons, these excess electrons are weakly bound in the material and their orbits are large, in an energy versus moment diagram their energy places them a little more below the conduction band, these materials are called DONORS.

If the replacement material has fewer electrons than the original material, one electron is missing to complete the bonds, so there is a movement of the other electrons, an easier way to analyze this movement of the (n-1) electrons is to suppose that The missing charge has a positive charge and to study its movement, this positive charge is called a hole, its binding energy is small so the orbit of the hole is large, in an energy diagram it is located a little above the band of valence, these are called ACCEPTORS

The Fermi level is defined as the point where the probability of finding the last electron is ½, when the temperature is changed the density of states of the bands changes, therefore the location point moves, but its [probability remains ½

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3 years ago
When two hydrogen atoms bond, the positive nucleus of one atom attracts the
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<span>When two hydrogen atoms bond, the positive nucleus of one atom attracts the electrons of both the atoms since the electrons are shared between the two atoms now.</span>
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The answer is:
     a. electron cloud
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3 years ago
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