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In an inelastic collision an electron excites a hydrogen atom from its ground state to a M-Shell state. A second electron collides instantaneously wit

Monjur Alahi

In an inelastic collision an electron excites a hydrogen atom from its ground state to a M-Shell state. A second electron collides instantaneously with the excited hydrogen atom in the m-Shell state and ionizes it. At leas how much energy the second electron transfors to the atom is the M-shell state?
A. `+3.4 eV`
B. `+1.51 eV`
C. ` -3.4 eV`
D. `-1.51 eV`


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Salim Ahmed Kawsar

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Correct Answer - D
The ground state of hydrogen (n=1) is represented by K, the first excited state (n=2) is represented by L,the second excited state (n=3) is represent byb M.So, the energy transferred by the second electron cab be given by
`E=-13.6((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))=-13.6 ((1)/(3^(2))-(1)/(oo^(2)))=-1.51ev`

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An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compou

Correct Answer - C Valency of A is 3 and that of X is (8-6), i.e.2

2 Answers 1 views
The energy of an element with a vacancy in K-shell is 35.2 V, in L-shell is 5.25 keV and in M-shell is 0.55 keV higher than the energy of the atom of

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Correct Answer - B Kinetic energy of electron in ground state =-(Totoal energy in this state) `" " --(13.6 )eV=13.6 eV`

2 Answers 1 views
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Correct Answer - D `a=omega^(2)r` As `" " omegaprop(1)/(n^(3))" " and " : r propn^(2)` `" "aprop(1)/(n^(4))` `rArr" " (a_(M))/(a_(L))=((2)/(3))^(4)=(16)/(81)`

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Correct Answer - A Minimum 10.2 eV energy is required to exctie a hydrogen atom. In perfectly inelastic collison maximum energy is lost. `:. "energy los" =(1)/(2)(2m)((v)/(2))^(2)=10.2xx1.6xx10^(-19)` `" " (1)/(4)mv^(2)=1.632xx10^(-18)`...

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Correct Answer - 2 Kinetic energy of electron `= 13.6 [1-1/9] eV = 12.1 eV`.

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Correct Answer - D `N= .^(n)C_(2) = .^(5)C_(2) = 10`

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Correct Answer - A::C::D `122.4 = (13.6Z^(2))/(1^(2)) rArr Z = 3, 91.8 = 122.4[1-(1)/(4)]` So an electron of KE `91.8 eV` can transfer its energy to this atom.

2 Answers 1 views
An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited and the colliding electron loses all its kinetic energ

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2 Answers 1 views

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