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A set of atoms in an excited state decay...

A set of atoms in an excited state decays

A

in general to any of the states with lowe 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 phtons only when they collide

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The correct Answer is:
A
A set of atom in an excited state decays in general to any of the states with lower energy.
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DC PANDEY ENGLISH-ATOMS-Taking it together
  1. Hydrogen atom does not emit X-rays because

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  2. Moseley's law for characteristic X-rays is sqrt v = a(Z-b). In this,

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  3. A set of atoms in an excited state decays

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  4. X-ray beam can be deflected

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  5. In an X - rays tube , the intensity of the emitted X - rays beam is in...

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  6. If the current in the circuit for heating the filament is increased, t...

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  7. X-rays are produced by jumping of:

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  8. The difference in angular momentum associated with electron in two suc...

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  9. Choose the incorrect statement regarding the Bohr model of the hydroge...

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  10. Which of the following parameters are the same for all hydrogen like a...

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  11. The second line in Paschen series is obtained when the electron makes ...

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  12. An electron moves in a circular orbit at a distance from a proton with...

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  13. Molybdenum is used as a target element for production of X - rays beca...

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  14. An X-ray has a wavelength of 0.010 Å. Its momentum is

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  15. X-rays of lamda = 1Å have frequency

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  16. The simple Bohr model cannot be directly applied to calculate the ener...

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  17. The velocity of an electron in the first orbit of H atom is v. The vel...

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  18. A X-ray tube operates at an accelerating potntial of 20 kV. Which of t...

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  19. A metal block is exposed to beams of X-rays of different wavelength. X...

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  20. O2 molecule consists of two oxygen atoms. In the molecule, nuclear for...

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