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CBSE 12th Standard Physics Subject Atoms HOT Questions 1 Mark Questions 2021

Published on: 27/05/2021

QB365 Provides the HOT Question Papers for Class 12 Physics, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics

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Std: 12th Standard CBSE - Physics

chapter: - HOT Questions

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Questions:

Generic 2

5 x 2 = 10

what conclusions were drawn from the observation in which few alpha-particle were seen rebounding from gold foil?

Why is it found experimentally difficult to detect neutrions in nuclear \(\beta -\)decay?

Why the simple Bohr's model cannot be directly applied to calculate the energy levels of an atom with many electrons?

When white light is passed through an unexcited gas, what happens to the transmitted light?

Imagine removing one election from He⁴ and He³.Their energy levels, as worked out on the basis of Bohr's model will be very close. Explain why?

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Answers Key:

Generic 2

5 x 2 = 10

The entire positive charge and the mass were concentrated at one place inside the atom, called the nucleus.

Neutrinos are neutral (chargeless),(almost) massless particles that hardly interact with matter.

As, electrons are not subjected to a central force, so Bohr's model cannot be applied to a multi-electron atom.

When white light is passed through a gas and analysed by spectrometer, we find some dark lines in the spectrum. These dark lines correspond precisely to those wavelengths which were found in the emission line spectrum of the gas. This is called absorption spectrum.

On removing one electron from He⁴ and He³, the energy levels, as worked out on the basis of Bohr's model will be very close as both the nuclei are very heavy as compared to electron mass. Also, after removing one electron, He⁴ and He³ atoms contain one electron and are hydrogen like atoms.