“Hydrogen Spectrum” MHT-CET Class 12 Physics Crash Course| Chapter Structure of Atoms and Nuclei
In this session G.S. Khairnar will discuss the theory and MCQ’s of Hydrogen Spectrum. The session will be useful for all the aspirants of MHT-CET 2022. The session will be in Marathi and English.
Points to recall:
According to Bohr’s 3 postulates
Let’s study concept of Hydrogen spectrum…….!
If the hydrogen atom is subjected to external energy & if it is equal or greater than B.E. (13.6 eV) then electron becomes free from atom. If absorbed energy is less than binding energy (+ 13.6 eV), then atom becomes excited. Its electron jumps to higher energy orbit. It stays in this state for short interval of time 10-8 sec. It jumps back to its ground state. This is called transition of electron. During such transition difference between energies of two states is radiated in the form of photon having frequency & wavelength.
Following spectral lines can be found during transition of electron………..!
1) Lyman series: – This series arises due to transition of electrons from outer orbits to the inner orbit whose quantum number is 1.
The wavelength is given by,
This series lines in ultraviolet region of spectrum.
2) Balmer Series:-This series arises due to transitions of electron from different outer orbits to the second orbit (p = 2).The wavelength is given by,
3) Paschen series:-This series due to transition of electrons from different outer orbits to the orbit (p = 3). The wavelength is given by,
Energy level diagram for hydrogen atom………….!
Go through the following diagram which indicates the transition of electrons from higher orbits to lower orbit for hydrogen atom.
Hydrogen Spectrum:-
Let’s solve the following multiple choice questions………..!
Q.1) The formula for wavelength of radiation during transition of electrons from higher orbit to lower orbit is….
Q.2) Which of the following equation is correct for longest wavelength in Paschen series?
For longest wavelength in Paschen series p=3, n=4
Q.3) Ratio of Longest to shortest wavelength in Balmer series is…
a) 5:9
b) 9:5
c) 25:81
d) 81:25
Answer
b) 9:5
Q.4) The wavelength of Brackett line during transition from 6th higher orbit is….
Q.5) Range of lines in Balmer series lies in……
a) infra red region
b) x-ray region
c) ultraviolet region
d) visible region
Answer
d) visible region
Q.6) The condition for longest wavelength in Brackett series is….
a) p= 5, n=6
b) p= 6, n=5
c) p= 4, n=5
d) p= 5, n=∞
Answer
c) p= 4, n=5
Q.7) The lines in Balmer series the transition of electrons from 4th orbit to 2nd orbit is known as
Q.8) Wave number for the longest wavelength in Lyman series is……
Q.9) Wave number for the 6th line in Brackett series is….
Q.10) Pfund series lines are lies in….
a) near-infra red region
b) mid-infra red region
c) far-infra red region
d) all of these
Answer
c) far-infra red region
♦ Important Links (महत्वाच्या लिंक्स) ♦
〉 Government Jobs.
〉 Private Jobs.
〉 सर्व परीक्षांच्या सराव प्रश्नपत्रिका (Question Papers).
〉 परीक्षेचे निकाल (Results).
〉 परीक्षा प्रवेशपत्र (Hall Tickets).
〉 MPSC भरती.
〉 Bank Jobs.
〉 Mega Bharti 2022.
〉 Current Affairs ((चालू घडामोडी).
〉 रोजगार मेळावा (Jobs Fairs).
♦जिल्हा नुसार जाहिराती ♦ |
|||||
| अहमदनगर | अकोला | अमरावती | औरंगाबाद | भंडारा | बुलढाणा |
| चंद्रपुर | धुले | गढ़चिरौली | गोंदिया | हिंगोली | जलगांव |
| जालना | कोल्हापुर | लातूर | मुंबई | नागपुर | नांदेड़ |
| नंदुरबार | नाशिक | उस्मानाबाद | पालघर | परभानी | पुणे |
| रायगढ़ | रत्नागिरि | सांगली | सातारा | सिंधुदुर्ग | सोलापुर |
| ठाणे | वर्धा | वाशिम | यवतमाल | बीड | |
♦शिक्षणानुसार जाहिराती ♦ |
|||||
| ७ वी (7th) | दहावी (SSC) | बारावी (HSC) | डिप्लोमा | आय.टी.आय | पदवी |
| पदव्युत्तर शिक्षण | बी.एड | एम.एड | एल.एल.बी / एल.एल.एम | बीएससी | एमबीए |
| बीसीए | एमसीए | बी.कॉम | एम.कॉम | GNM/ANM | एमएससी |
| बी.फार्म | एम.फार्म | बी.ई | एम.ई | BAMS/BHMS | एम.बी.बी.एस / एम.डी |
| बी.टेक | एम.टेक | MS-CIT | |||
