Home 2nd Year Physics Notes Class 12 Physics Chapter 20 Short Questions and Numerical Notes- Atomic Spectra

# Class 12 Physics Chapter 20 Short Questions and Numerical Notes- Atomic Spectra

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In this post, I am sharing the Class 12 Physics Chapter 20 Short Questions and Numerical Notes PDF for the students of Intermediate Part 2. This chapter’s name is Atomic Spectra. Students can download the Class 12 Physics Chapter 20 Short Questions and Numerical Notes PDF on their laptops or mobile. These Physics Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 2nd Year Physics Notes PDF chapters.

## FSC Part 2 Physics Chapter 20 Short Questions and Numerical Notes – Atomic Spectra

Class 12 Physics Notes

#### Boh’rs theory of the hydrogen atom is based upon several assumptions. Do any of these assumptions contradict classical physics?

Yes Boh’s first postulate contradict with classical physics. According to classical physics every moving particle radiate energy continuously therfore, accelerated electron must radiate energy but according to Bohr’s theory an election does not radiate energy when moving around the nucleus.

#### What is meant by a line spectrum? Explain, how line spectrum can be used for the identification of elements?

When atoms of an element are excited by absorbing the energy from the incident photon, the excited atoms returns to the ground state by the emission of energy forms a spectrum of definite spectral lines, such a spectrum is called a line spectrum. A spectrum sonsists of discrete lines. Thus we can identify different elements because each element has characteristic line of definite wavelength.

#### Can the electron in the ground state of the hydrogen atom absorb a photon of energy 13.6 eV and greater than 13.6eV?

Yes, photon of energy 13.6 eV will be absorbed by the electron in the ground state of hydrogen atom for ionization because ionization energy of hydrogen atom is 13.6 eV. but if energy of photom is greater than 13.6 eV then surplus is changed into kinetic energy of electron.

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