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First orbit velocity of electron is 2.1 ...

First orbit velocity of electron is `2.1 xx 10^(6) m//s` then the velocity of 3rd orbit electron is

A

`7 xx 10^(6) m//s`

B

`6 xx 10^(6) m//s`

C

`7 xx 10^(7) m//s`

D

`0.7 xx 10^(6) m//s`

Text Solution

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The correct Answer is:
D
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Column-I (A) Electron moving in 2nd orbit in He ^(+) electron is (B) Electron moving in 3 ^(rd) orbit in H-atom (C ) Electron moving in 1 ^(st) orbit in Li ^(+2) ion (D) Electron moving in 2 ^(nd) orbit in Be^(+3) ion Column-II (P) Radius of orbit in which moving is 0.529Å (Q) Total enrgy of electron is (-) 13.6 xx 9 eV (R) Velocity of electronis ( 2. 188 xx 10 ^(6))/(3)m//s (S) De-broglie wavelength of electron is sqrt((150)/(13.6))Å

The velocity of an electron in the second Bohr orbit of an element is 1.1 xx 10^(6) s^(-1) Its velocity in the third orbit is

Knowledge Check

  • If the velocity of an electron in its first orbit of hydrogen atom is 2.1 xx10^(6) m/s, then its velocity in the third orbit is

    A
    `7xx10^(6) m//s`
    B
    `7xx10^(5) m//s`
    C
    `7xx10^(4) m//s`
    D
    `2xx10^(4) m//s`

  • If v_(0) is the velocity of electron in the first orbit of hydrogen atom, then the velocity of electron in the first orbit of Li^(2+) ion will be.....

    A
    `v_(0)`
    B
    `2v_(0)`
    C
    `3v_(0)`
    D
    `5v_(0)`

  • If the radius of an orbit is r and the velocity of electron in it is v , then the frequency of electron in the orbit will be

    A
    `2 pi r v`
    B
    `(2 pi)/(v r)`
    C
    `(v r)/(2 pi)`
    D
    `(v)/(2 pi r)`

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