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Emission and Absorption Spectra

A continuum i...

Question

A continuum in line spectra represents the state:

when lines become more and more densely spaced

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a region of continuous absorption or emission of radiation without any line spectra

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the electron becomes completely free from the nucleus and it is no longer restricted to discrete quantised energy states but may take up continuously the kinetic energy of translation corresponding to its speed in free space

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all the above

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Solution

The correct option is A all the above

A spectral continuum occurs when the interactions of a large number of atoms, ions or molecules spread out all of the discrete emission lines of an object, so they can no longer be distinguished.

A continuum in line spectra represents the state when electron becomes completely free from the nucleus and it is no longer restricted to discrete quantised energy states but may take up continuously the kinetic energy of translation corresponding to its speed in free space.

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Similar questions

Q. Calculate the frequency, energy and wavelength of the radiation corresponding to spectral line of lowest frequency in Lyman series in the spectra of hydrogen atom. Also calculate the energy of the corresponding line in the spectra of

{L i}^{2 +}

DEFINITION VALID FOR SINGLE ELECTRON SYSTEM:
Ground state: Lowest energy state of any atom or ion is called ground state of the atom. It is n

=

1.
Excited energy (IE): Minimum energy required to move an electron from ground state to n

= \infty

is called ionisation energy of the atom or ion.
Ionisation Potential (I.P): Potential difference through which a free electron must be accelerated from rest, such that its kinetic energy becomes equal to ionisation energy of the atom is called ionisation potential of the atom.
Excitation Energy: Energy required to move an electron from ground state of the atom to any other state of the atom is called excitation energy of that state.
Excitation Potential: Potential difference through which an electron must be accelerated from rest to so that its kinetic energy become equal to excitation energy of any state is called excitation potential of that state.
Binding Energy 'or' Separation Energy: Energy required to move an electron from any state to n=

\infty

is called binding energy of the state.
The wavelength of the photon emitted upon an electronic transition from

n_{2}

n_{1}

orbit in a H-like species is given by the formula:

\frac{1}{λ} = R Z^{2} (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})

Now answer the following question:

If the binding energy of II excited state of a H-like species is 13.6 eV then:

Q. If radiation corresponding to second line of "Balmer series" of

L i^{2 +}

ion, knocked out electron from first excited state of H-atom, then kinetic energy of ejected electron would be:

Q. Which of the following statements is/are correct?
1. A nucleus in an excited state may give up its excitation energy and return to the ground state by emission of electromagnetic

γ

-radiation.
2.

γ

-radiations are emitted as secondary effect of

α

and

β

-emission.
3. The nuclear isomers produced by

γ

-ray bombardment have the same atomic and mass number but differ in their lifetimes (whatever their ground state may be).
4.

X

-ray and

γ

-ray are both electromagnetic.

Q. Assertion :Between any two given energy levels, the number of absorption transitions is always less than the number of emission transitions. Reason: Absorption transitions start from the lowest energy level only and may end at any higher energy level. But emission transitions may start from any higher energy level and end at an energy level below it.

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