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
A set of atoms in an excited state decays in general to any of the states with lower energy. Choice (a) Is correct.
Promotional Banner

Topper's Solved these Questions

  • ATOMS AND NUCLEI

    PRADEEP|Exercise NCERT Multiple choice (II) questions 8|1 Videos

  • ATOMS AND NUCLEI

    PRADEEP|Exercise NCERT Multiple choice (II) questions 9|1 Videos

  • ATOMS AND NUCLEI

    PRADEEP|Exercise NCERT Multiple choice (I) questions 5|2 Videos

  • COMMUNICATION SYSTEMS

    PRADEEP|Exercise MODEL TEST PAPER-2|9 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 ?

A hypothetical atom has energy levels uniformly separated by 1.2 eV. At a temperature of 2000 K, what is the ratio of the number of atoms in the 13th excited state to the number in the 11th excited state?