The wavelengths involved in the spectrum of deuterium \left ( _{1}^{2} D\right ) are slightly different from that of hydrogen spectrum, because

  • Option 1)

    size of the two nuclei are different

  • Option 2)

    nuclear forces are different in the two cases

  • Option 3)

    masses of the two nuclei are different

  • Option 4)

    attraction between the electron and the nucleus is different in the two cases.

 

Answers (1)

As we learnt in

Effect of nucleas motion on radius of atom -

r_{n}^{1}= r_{n}\left ( 1+\frac{m_{e}}{m_{N}} \right )

- wherein

r_{n}^{1}=  Radius  of nth orbital with nucleus motion

r_{n}= Radius of nth orbital without nucleus motion

m_{e}=mass of electron

m_{N}=mass of nucleus

 

 

Masses of    {_{1}}H^{1}    and   {_{1}}D^{2} are different. Hence the corresponding wavelengths are different.

Correct option is 3.


Option 1)

size of the two nuclei are different

This is an incorrect option.

Option 2)

nuclear forces are different in the two cases

This is an incorrect option.

Option 3)

masses of the two nuclei are different

This is the correct option.

Option 4)

attraction between the electron and the nucleus is different in the two cases.

This is an incorrect option.

Preparation Products

Knockout JEE Main April 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 4999/-
Buy Now
Knockout JEE Main May 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 9999/-
Buy Now
Test Series JEE Main May 2021

Unlimited Chapter Wise Tests, Unlimited Subject Wise Tests, Unlimited Full Mock Tests, Get Personalized Performance Analysis Report,.

₹ 6999/- ₹ 2999/-
Buy Now
Knockout JEE Main May 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 14999/-
Buy Now
JEE Main Rank Booster 2021

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions