Answer:
Explanation:
Niels Bohr was a Danish physicist who proposed the hydrogen atom quantum model to explain the discontinuity of the atom's emission spectra.
In Bohr hydrogen atom model, the electrons occupy orbits identified with the numbers n = 1, 2, 3, 4, ... Each number (orbit) corresponds to a different energy level or state. The number n = 1 corresponds to the lowest energy level, and each higher number corresponds to a higher energy level.
This table shows the relative energy of the different orbits of the Bhor hydrogen atom:
Orbit Quantum Energy Relative
number level energy
First n = 1 1 E₁
Second n = 2 2 2E₁
Third n = 3 3 9E₁
Fourth n = 4 4 16E₁
Fifth n = 5 5 25E₁
Sixth n = 6 6 36E₁
Seventh n = 7 7 49E₁
When an electron jumps from a higher energy state down to a lower energy state, it emits a photon with an energy equal to the difference of the energies between the initial and the final states.
Since the n = 6 to n = 1 transition results in the higher relative energy difference (36E₁ - E₁ = 35E₁), you conclude that it is this transition which results in the emission of the highest-energy photon, which is the option A.
In the Bohrhydrogen atom model, the highest energy photon is emitted during the transition from the highest energy level to the lowest energy level. For the given options, the highest energy photon would be emitted in the transition from n=6 to n=1.
In the Bohr hydrogen atom model, the highest energyphoton is emitted during the transition from the highest energy level to the lowest energy level. In our choices, the largest transition (indicating the greatest energy change) is from n=6 to n=1. This is because the energy difference between the energy levels is the greatest, resulting in the emission of a photon with the highest energy.
In general, the greater the transition between the energy levels in a hydrogen atom (i.e. the more levels the electron 'jumps' downward), the higher the energy of the emitted photon.
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b)They have different numbers of neutrons and different charges.
c)They have different numbers of protons and different mass numbers.
d)They have different numbers of neutrons and different mass numbers.
Boron occurs naturally as two isotopes that is they have the same number of protons and different numbers of neutrons with different atomic charges. Option D is correct.
These are the variations of elements having the same number of protons and electrons and different numbers of neutrons. As they are neutral in charge and their mass is totally negligible as compared to the mass of proton as they both are located at the center of the atom
The center of the atom is the nucleusas there are some more species of element isobars isotones isoelectronic. Isobars are those species that have the same neutronic numbers with different photonic and electronic numbers
The isotopes of boron are boron10, boron12, boron14, etc. .Carbon is another compound that is having 3 isotopes carbon12 carbon13, and caobon14. But mostly their properties are the same with a little difference between them
Therefore, the correct option is D.
Learn more about isotopes, here:
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(B) fluorous acid
(C) perfluoric acid
(D) hydrofluoric acid
(E) hypofluorous acid
Answer:
The correct answer is CO2 diffuses passively out of the cell.
Explanation:
Carbon dioxide is one of the end product of cellular metabolism.CO2 is produced as waste material inside the body after cellular respiration.
Carbon dioxide is transported out from the body by passive diffusion process which helps the CO2 gas to move along the concentration gradient from high concentration region(body) to the low concentration region(atmosphere).
Thus CO2 ia being eliminated from our body.
Given:
Distance of solvent front = 68 mm
Distance of unknown = 48 mm
To determine:
The rf value
Explanation:
The retention factor or the rf value is given by the ratio of distance traveled by the unknown to the distance traveled by the solvent front
RF = distance by unknown/distance by solvent
RF = 48/68 = 0.706
Ans: the RF value is 0.706
The Rf (Retention factor) value can be calculated using the given distances traveled by the solvent and the substance. The Rf value in this case is approximately 0.71.
The Rf value or Retention factor value in chromatography can be calculated with the given parameters of solvent front and the distance the substance travelled from the original spot. The formula to calculate the Rf value is: Rf = distance traveled by the substance / distance traveled by the solvent. So, in this case, it would be: Rf = 48mm / 68mm which is approximately 0.71.
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B) vacuole.
C) cytoplasm.
D) membrane.
Answer:
A) nucleus
Explanation:
The nucleus of a cell contains chromosomes, which contain DNA. This gives a cell unique characteristics.
Answer:
Comets are composed of ice, dust and frozen gases. The core of the comet is known as nucleus which is formed of rocks and frozen gases. Coma is the atmosphere of the comet. As the comet enters the inner solar system, the coma expands due to sublimation of frozen gases. As it nears the sun, the coma extends backwards and forms a long tail. It extends backwards due to the solar wind. The charged particles from the sun take away the evaporated material and dust of the comet backwards forming tail.
As a comet approaches the Sun, it starts to heat up. The ice transforms directly from a solid to a vapor, releasing the dust particles embedded inside. Sunlight and the stream of charged particles flowing from the Sun – the solar wind – sweeps the evaporated material and dust back in a long tail.