Home
Class 12
PHYSICS
A set of atom in an excited state decays...

A set of atom in an excited state decays

A

in general to any of the states with lower energy.

B

into a lower state only when excited by an external electric field.

C

all together simultaneously into a lower state .

D

to emit photons only when they collide.

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

which must represent an atom in an excited state?

A hypothetica atom has energy levels uniformaly separated by 1.3 eV. At a temperature 2500k, what is the ratio of number of atoms in 15th excited state to the number in 13 th excited state.

A hydrogen atom initially in the ground state is excited by absorbing a photon of wavelenght 980 Å.The redius of the atom in the excited state ,in terms of Bohr radius a_(0) will be : (hc= 12500 eV- Å)

An electron is at ground state of the H atom. The minimum energy required to excite the H atom into the second excited state is

An atom stays in an excited state for about

What is covalency of chlorine atom in second excited state ?

NARAYNA-ATOMS -EXERCISE -4
  1. If the wavelength of the first member of Balmer series of hydrogen spe...

    Text Solution

    |

  2. A hydrogen like atom (atomic number Z) is in a higher excited state of...

    Text Solution

    |

  3. Photon from n=2 to n=1 in hydrogen atom is made to fall on a metal su...

    Text Solution

    |

  4. Let nu(1) be the frequency of the series limit of the lyman series n...

    Text Solution

    |

  5. (a) (i) Find the wavelength of the radiation required to excite thye e...

    Text Solution

    |

  6. Find the wavelength in a hydrogen spectrum between the range 500nm to ...

    Text Solution

    |

  7. The largest wavelength in the ultraviolet region of the hydrogen spect...

    Text Solution

    |

  8. The electric potential between a proton and as electron is given by V=...

    Text Solution

    |

  9. If elements of quantum number greater than n were not allowed , the nu...

    Text Solution

    |

  10. Magnetic field at the center (at nucleus) of the hydrogen like atom ("...

    Text Solution

    |

  11. The recoil speed of a hydrogen atom after it emits a photon in going f...

    Text Solution

    |

  12. The binding energy of an electron in the ground state of He atom is E(...

    Text Solution

    |

  13. In hydrogen atom, the radius of n^(th) Bohr orbit is r(n). The graph B...

    Text Solution

    |

  14. In hydrogen atom, the area enclosed by n^(th) orbit is A(n). The graph...

    Text Solution

    |

  15. An electron in the ground state of hydrogen atom is revolving in antic...

    Text Solution

    |

  16. if we assume only gravitational attraction between proton and electro...

    Text Solution

    |

  17. Taking the Bohr radius a(0) = 53 pm, the radius of Li^(++) ion in its ...

    Text Solution

    |

  18. The simple Bohr model cannot be directly ap-plied to calculate the ene...

    Text Solution

    |

  19. Two H atoms in the ground state collide in elastically. The maximum am...

    Text Solution

    |

  20. A set of atom in an excited state decays

    Text Solution

    |