Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

Light of wavelength 1281.8nm is emitted when an electron of hydrogen atom drops from 5th to 3rd energy level calculate the wavelength of the photon emitted when electron falls from 3rd to ground level. 
Asked by Taniyarana150 | 23 May, 2019, 12:01: AM
answered-by-expert Expert Answer
Energy change in emission is calculated by-
C a s e minus left parenthesis 1 right parenthesis increment E equals fraction numerator h C over denominator lambda end fraction space space space space space space equals negative R left parenthesis 1 over n subscript 2 squared minus 1 over n subscript 1 squared right parenthesis space space space space space fraction numerator R over denominator C h end fraction space space equals fraction numerator negative left parenthesis begin display style 1 over n subscript 2 squared end style minus 1 over n subscript 1 squared right parenthesis over denominator lambda end fraction space space space space space space space space space space space space space space equals fraction numerator negative left parenthesis 1 over 3 squared minus 1 over 5 squared right parenthesis over denominator 12818 cross times 10 to the power of negative 9 end exponent end fraction space space space space space space space space space space space space left parenthesis 1 m equals 10 to the power of negative 9 end exponent m right parenthesis C a s e minus left parenthesis 2 right parenthesis 1 over lambda equals negative fraction numerator R over denominator C h end fraction left parenthesis 1 over n subscript 2 squared minus 1 over n subscript 1 squared right parenthesis 1 over lambda equals negative fraction numerator negative left parenthesis 1 over 3 squared minus 1 over 5 squared right parenthesis over denominator 12818 cross times 10 to the power of negative 9 end exponent end fraction left parenthesis space 1 over 2 squared space minus 1 over 3 squared space right parenthesis space space space space space lambda space space equals space space 129782.25 space cross times 10 to the power of negative 9 end exponent space m
Answered by Ravi | 23 May, 2019, 12:50: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Chemistry
calculate the number of emitted per by a bulb 60 watt the wavelength of bulb 2000A
Asked by habibakhatoon112 | 15 Jul, 2022, 09:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
what is science
question image
Asked by akankhyapradhan123 | 22 Oct, 2021, 07:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Why ionisation energy is always positive
Asked by kusumghosh71 | 21 Aug, 2021, 10:59: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
chemistry atomicstructure
question image
Asked by muramshettyaashrith218 | 16 Sep, 2020, 09:58: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
The wavelength of a spectral line for an electronic transition is inversely proportional to : (1) number of electrons undergoing transition (2) the nuclear charge of the atom (3) the velocity of an electron undergoing transition (4) the difference in the energy involved in the transition
Asked by nandanappillai | 21 May, 2020, 01:08: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
a photon of 3000 Angstrom is absorbed by a gas and then re-elected as two photons. One photon is red 7600  Angstrom  .  What wavelength of other photon?  Here I am knowing solution but I am not able to understand that why we are using formula ( h*c/lambda of total =  h*c/lambda of 1 +h*c / lambda of 2 ) Please solve it 
Asked by rajarage18 | 23 Jan, 2020, 08:00: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Formula of energy
Asked by kuldeepsingh33087 | 27 Jul, 2019, 11:35: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Solved numerical s on Plank quantum theory?  
Asked by vijaykumartecno348 | 06 Jul, 2019, 09:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Light of wavelength 1281.8nm is emitted when an electron of hydrogen atom drops from 5th to 3rd energy level calculate the wavelength of the photon emitted when electron falls from 3rd to ground level. 
Asked by Taniyarana150 | 23 May, 2019, 12:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Hi 
question image
Asked by jain.pradeep | 02 May, 2019, 11:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×