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 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
A set of atoms in an excited state decays in general to any of the states with lower energy.
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    NCERT EXEMPLAR|Exercise Alternating Current|31 Videos

  • COMMUNICATION SYSTEM

    NCERT EXEMPLAR|Exercise Communication System|30 Videos

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 ?

NCERT EXEMPLAR-ATOMS-Atoms
  1. O(2)molecules consists of two oxygen atoms. In the molecules , nuclear...

    Text Solution

    |

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

    Text Solution

    |

  3. A set of atom in an excited state decays

    Text Solution

    |

  4. An ionised H-molecules consists of an electron and wo protons. The pro...

    Text Solution

    |

  5. Consider aimimg a beam of free electrons to wards free atoms . When th...

    Text Solution

    |

  6. The bhor model for the spectra of H-atom

    Text Solution

    |

  7. The balmer series for the H-atom can be ob-served

    Text Solution

    |

  8. Let E=(-1me^(4))/(8epsilon(0)^(2)n^(2)h^(2)) be the energy of the n^(t...

    Text Solution

    |

  9. The simple Bohr model is not applicable to He^(4) atom because

    Text Solution

    |

  10. The mass of a H-atom is less than the sum of the masses of a proton an...

    Text Solution

    |

  11. Imagine removing one electron from He^(4) and He^(3). Their energy lev...

    Text Solution

    |

  12. When an electron falls from a higher energy to a lower energy level,...

    Text Solution

    |

  13. Would the Bohr formula for the H-atom remain unchanged if proton had a...

    Text Solution

    |

  14. Consider two different hydrogen atoms. The electron in each atom is in...

    Text Solution

    |

  15. Positronium is just like a H-atom with the proton replaced by the posi...

    Text Solution

    |

  16. Assume that their is no repulsive force be -tween the electrons in an ...

    Text Solution

    |

  17. Using Bohr model, calculate the electric current created by the electr...

    Text Solution

    |

  18. Show that the first few frequencies of light that are emitted when ele...

    Text Solution

    |

  19. What is the minimum energy that must be given to a H atom in ground st...

    Text Solution

    |

  20. The first four spectral lines in the Lyman series of a H-atom are lamb...

    Text Solution

    |