Chemistry, 13.11.2019 04:31 kawaunmartinjr10

Simplified. the absorption spectra of ions have been used to identify the presence of the elements in the atmospheres of the sun and other stars. what is the energy of a photon (in j) that is absorbed by he+ ions, when an electron is excited from the bohr orbit with n = 1 to the n = 4 state? the energy of an electron in the nth level is

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Answer from: johnsonkia873

Answer : The energy of a photon absorbed by He^+ ions is $8.18\times 10^{-18}J$

Explanation :

The energy of an electron in the nth level is,

$E_n=-\frac{BZ^2}{n^2}$

where,

E_n = energy of an electron in the nth level

B = constant = $2.18\times 10^{-18}J$

n = number of energy level

Z = charge on nucleus or number of protons

First we have to calculate the energy of an electron for n = 1 level.

$E_1=-\frac{BZ^2}{1^2}$

Z = charge on nucleus or number of protons for helium atom = 2

$E_1=-\frac{(2.18\times 10^{-18})\times (2)^2}{1^2}$

$E_1=-8.72\times 10^{-18}J$

Now we have to calculate the energy of an electron for n = 4 level.

$E_4=-\frac{BZ^2}{4^2}$

Z = charge on nucleus or number of protons for helium atom = 2

$E_4=-\frac{(2.18\times 10^{-18})\times (2)^2}{4^2}$

$E_4=-5.45\times 10^{-19}J$

Now we have to calculate the energy of a photon that is absorbed by He^+ ions.

E=E_4-E_1

$E=(-5.45\times 10^{-19})-(-8.72\times 10^{-18})$

$E=8.18\times 10^{-18}J$

Therefore, the energy of a photon absorbed by He^+ ions is $8.18\times 10^{-18}J$

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

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