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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.
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Knowledge Check

  • which must represent an atom in an excited state?

    A
    `1s^(2)2s^(2)2p^(1)`
    B
    `1s^(2)2s^(2)2p^(2)`
    C
    `1s^(2)2s^(2)2p^(2)3s^(1)`
    D
    `1s^(2)2s^(2)2p^(5)`

  • Which electronic configuration must represent an atom in an excited state?

    A
    `1s^(2),2s^(2)2p^(1)`
    B
    `1s^(2),2s^(2)2p^(2)`
    C
    `1s^(2),2s^(2)2p^(2),3s^(1)`
    D
    `1s^(2),2s^(2)2p^(5)`

  • The number of unpaired electrons in carbon atom in excited state is

    A
    One
    B
    Two
    C
    Three
    D
    Four

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    An atom stays in an excited state for about

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