Home
Class 11
CHEMISTRY
Energy of electron is given by E=-2.178x...

Energy of electron is given by `E=-2.178xx10^(-18)((Z^(2))/(n^(2)))`J.
Wavelength of light required to excited an electron in an hydrogen atom from level n=1 to n=2 will be `(h=6.62xx10^(-34)J*s and c=3.0xx10^(8)m*s^(-1))`-

A

`8.500xx10^(-7)m`

B

`1.214xx10^(-7)m`

C

`2.816xx10^(-7)m`

D

`6.500xx10^(-7)m`

Text Solution

Verified by Experts

The correct Answer is:
B
`E=-2.178xx10^(-8)Z^(2)((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))`
`=-2.178xx10^(-8)[(1)/((2)^(2))-(1)/((1)^(2))]" "[For " "H,Z=1]`
`=1.6335xx10^(-18)J`
Again, `lamda=(hc)/(E)=(6.62xx10^(-34)xx3xx10^(8))/(1.6335xx10^(-18))=1.214xx10^(-7)m`
Promotional Banner

Topper's Solved these Questions

  • STRUCTURE OF ATOM

    CHHAYA PUBLICATION|Exercise MCQ HOTSPOT (SINGLE CORRECT TYPE)|68 Videos

  • STRUCTURE OF ATOM

    CHHAYA PUBLICATION|Exercise EXERCISE (VERY SHORT TYPE QUESTION)|33 Videos

  • STRUCTURE OF ATOM

    CHHAYA PUBLICATION|Exercise HIGHER ORDER THINKING SKILL (HOTS) QUESTIONS|19 Videos

  • STATES OF MATTER : GASES AND LIQUIDS

    CHHAYA PUBLICATION|Exercise PRACTICE SET|10 Videos

Similar Questions

Explore conceptually related problems

The ionisation enthalpy of hydrogen atom is 1.312xx10^(6)J*mol^(-1) . The energy required to excited the electron in the atom from n=1 to n=2 is-

Calculate the momentum of a photon of frequency 5 xx 10^(13) Hz .Given, h = 6.6 xx 10^(-34)J.s and c = 3 xx 10^(8) m.s^(-1)

To which orbit the electron in the hydrogen atom (ground state) will jump of absorbing 2.044xx10^(-18)J of energy.

Calculate the velocity of an electron having de Broglie wavelength of 200 Å. [m=9.11xx10^(-31)kg,h=6.626xx10^(-34)J*s] .

Estimate the kinetic energy of electron that hit the target in a Coolidge tube and produce X-ray of wavelength 1 Å . Given h=6.62xx10^(-34)J *s,c=3xx10^(8)m*s^(-1) .

Calculate the energy in joule corresponding to light of wavelength 45 nm. (plancks constant, h=6.63xx10^(-34)J*s , speed of light c=3xx10^(8)m*s^(- ))-

Find the wavelength of an electron having kinetic energy 10 eV. (h = 6.33 xx 10^(-34) J.s, m_(e) = 9 xx 10^(-31) kg)

According to Bohr's theory, energy of electron in n-th orbit of H-atom, E_(n)=-(21.76xx10^(-19))/(n^(2))J . Find the longest wavelength of radiation required to remove one electron from the 3rd orbit of He^(+) ion.

Find the wavelength of radiation required to excite the electron in ground level of Li^2+ (Z=3) to third energy level. Also find the ionization energy of Li^2+(R=1.09xx10^7m^-1) .

CHHAYA PUBLICATION-STRUCTURE OF ATOM-ENTRANCE QUESTION BANK
  1. Outer electronic configuration of Gd (atomic no: 64) is-

    Text Solution

    |

  2. The electrons identified by quantum number n and l, (a) n=4,l=1 (b...

    Text Solution

    |

  3. Energy of electron is given by E=-2.178xx10^(-18)((Z^(2))/(n^(2)))J. ...

    Text Solution

    |

  4. The correct set of four quantum numbers of the valence electrons of ru...

    Text Solution

    |

  5. Which of the following is the energy of a possible excited state of hy...

    Text Solution

    |

  6. A stream of electrons from a heated filament was passed between two ch...

    Text Solution

    |

  7. The radius of the second Bohr orbit for hydrogen atom is [Planck's con...

    Text Solution

    |

  8. If n=6, correct sequence for filling of electrons will be-

    Text Solution

    |

  9. The energies E(1) and E(2) of two radiations are 25eV and 50eV respect...

    Text Solution

    |

  10. Total number of orbitals in 4th energy level of an atom is-

    Text Solution

    |

  11. According to Bohr's theory, which of the following transition is H-ato...

    Text Solution

    |

  12. The correct set of four quantum numbers for the valence electron of ru...

    Text Solution

    |

  13. What is the maximum number of electrons that can be associated with th...

    Text Solution

    |

  14. The value of Planck's constant is 6.63xx10^(-34)J*s. The speed of ligh...

    Text Solution

    |

  15. Based on equation E=-2.178xx10^(-18)((z^(2))/(n^(2)))J, certain conclu...

    Text Solution

    |

  16. What is the maximum number of electrons that can be associated with th...

    Text Solution

    |

  17. Calculate the energy in joule corresponding to light of wavelength 45 ...

    Text Solution

    |

  18. What is the maximum number of orbitals that can be identified with the...

    Text Solution

    |

  19. Which is the correct order of increasing energy of the listed orbitals...

    Text Solution

    |

  20. Gadolinium belongs to 4f-series. Its atomic number is 64. which of the...

    Text Solution

    |