Answer:
Approximately .
Explanation:
The Lyman Series of a hydrogen atom are due to electron transitions from energy levels to the ground state where . In this case, the electron responsible for the line started at and transitioned to
A hydrogen atom contains only one electron. As a result, Bohr Model provides a good estimate of that electron's energy at different levels.
In Bohr's Model, the equation for an electron at energy level (
(note the negative sign in front of the fraction,)
where
- is a constant.
- is the atomic number of that atom. for hydrogen.
- is the energy level of that electron.
The electron that produced the line was initially at the
.
The electron would then transit to energy level . Its energy would become:
.
The energy change would be equal to
.
That would be the energy of a photon in that spectrum line. Planck constant relates the frequency of a photon to its energy:
, where
- is the energy of the photon.
- is the Planck constant.
- is the frequency of that photon.
In this case, . Hence,
.
Note that .
Answer:
if you are talking about miles the answer would be is 0.0001509932(divided by 160934)
if you are talking about mililiters it would be 24.3(multiply times one)
hope this helps
Answer:
42.3moles
Explanation:
The chemical equation given in this question is as follows:
H2 + O2 → H2O
However, this equation is unbalanced, the balanced chemical equation is as follows:
2H2 + O2 → 2H2O
This equation shows that;
2 moles of hydrogen gas (H2) will produce 2 moles of water (H2O)
Hence, If 42.3 moles of water (H2O) are produced, 42.3 × 2/2
= 42.3moles of hydrogen was reacted.
Answer:
There are three significant problems:
The Flatness Problem:
WMAP has determined the geometry of the universe to be nearly flat. However, under Big Bang cosmology, curvature grows with time. A universe as flat as we see it today would require an extreme fine-tuning of conditions in the past, which would be an unbelievable coincidence.
The Horizon Problem:
Distant regions of space in opposite directions of the sky are so far apart that, assuming standard Big Bang expansion, they could never have been in causal contact with each other. This is because the light travel time between them exceeds the age of the universe. Yet the uniformity of the cosmic microwave background temperature tells us that these regions must have been in contact with each other in the past.
The Monopole Problem:
Big Bang cosmology predicts that a very large number of heavy, stable "magnetic monopoles" should have been produced in the early universe. However, magnetic monopoles have never been observed, so if they exist at all, they are much more rare than the Big Bang theory predicts.
Answer:
E
Explanation:
From the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another. The kind of energy in fuels can be said to be chemical energy. This chemical energy in fuel is good enough to do some work by its conversion process to other forms of energy. It is the end of the last amount of this conversion that brings us to the term that the fuel is exhausted and we need to refuel so as to be able to do more work of conversion.
The chemical energy in fuels is usually converted to heat energy in cylinders which can then be converted to make the vehicle move from one point to another with a continuous conversion of this fuel.