Question

3
(a) What is emission spectrum? Discuss its types.
(b) Explain the molecular spectra. Which energies are included in total energy of
molecule.
(अ) उत्सर्जन स्पेक्ट्स क्या होता हैं? इसके प्रकारों क वर्णन कीजिए।
(ख) आण्विक स्पेक्ट्रा को समझाइए। अणु की कुल ऊर्जा में कौन कौन सी ऊर्जाएं शामिल
होती हैं?​

Answer 1

Answer:

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Answer 2

Spectrum:

Explanation:

(a)

• The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted by an atom or molecule making a transition from a high energy state to a lower energy state.
• The emission spectrum of each element is exclusive.
• The emission spectrum has three types:

1. Continuous spectrum
2. Line spectrum
3. Band spectrum

Continuous spectrum:

• This spectrum depends only on the temperature of the source and is independent of the characteristic of the source.
• Incandescent solids, liquids, Carbon arc, electric filament lamps, etc, are examples of a continuous spectrum.  

Line spectrum:

• Line spectrum is sharp lines of definite wavelengths.
• It is the characteristic of emitting material.
• It is used to identify gaseous substances.

Band Spectrum:

• It consists of a number of bright bands with a sharp edge at one end but attenuation at the other end.
• Band spectrum is obtained from molecules.
• Using band spectrum the molecular structure of the substance being studied.

(b)

• Molecular spectrum is observed when a molecule undergoes the absorption or emission of electromagnetic radiation with a resulting increase or decrease in energy.
• The sum of the potential energy & the kinetic energy is termed as the total energy of a molecule.