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12th Class Physics
Short Questions Preparation
Start Chapter 20 Preparation
12th Class Physics Chapter Wise Preparation
Online Short Questions For Chapter 9 "ICS Part 2 Physics Chapter 20 Short Questions Preparation "
Try The Short Questions For ICS Part 2 Physics Chapter 20 Short Questions Preparation
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Total Questions10
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Available Sets3
Physics - ICS Part 2 Physics Chapter 20 Short Questions Preparation
Question # 1
In which region of electromagnetic spectrum does the following series fall (a)Lyman series (b)Balmer series?
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Ans 1: Balmer series falls in the visible region.Lyman series falls in the ultraviolet region.
ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 1
Question # 1
In which region of electromagnetic spectrum does the following series fall (a)Lyman series (b)Balmer series?
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Ans 1: Balmer series falls in the visible region.Lyman series falls in the ultraviolet region.
ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 2
Question # 1
Differentiate between Line and Band spectrum.
- Ans 1: Line spectrum: When electron jumps from higher orbit to lower orbit ,it emits energy,This emission of energy constitutes spectral line,This is called the line spectrum.
- Ans 2: Band spectrum:is produced by molecules,They are the groups of lines which are closely spaced to another.
ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 3
Question # 1
Distinguished between stimulated emission and spontaneous emission.
- Ans 1: Stimulated emission: If a atom is excited for a longer lifetime of about 10-3sec than an incident photon of energy equal to the difference of two energy levels induces the atom to decay by emitting a photon that travel in the direction of incident photon.This process is called stimulated or induced emission.
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Ans 2: Spontaneous Emission: As excited is highly unstable with life time of10-8sec,so electron will de excite itself with emission of a photon in any arbitrarydirection is called spontaneous emission.
