To Which Orbit The Electron In The Hydrogen Atom Will Jump On Absorbing 12.1 EV Of Energy? 

Why Kaysons ?

Video lectures

Access over 500+ hours of video lectures 24*7, covering complete syllabus for JEE preparation.

Online Support

Practice over 30000+ questions starting from basic level to JEE advance level.

Live Doubt Clearing Session

Ask your doubts live everyday Join our live doubt clearing session conducted by our experts.

National Mock Tests

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

Organized Learning

Proper planning to complete syllabus is the key to get a decent rank in JEE.

Test Series/Daily assignments

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.



To which orbit the electron in the hydrogen atom will jump on absorbing 12.1 eV of energy? 


Correct option is



Energy of electron in the nth orbit of H-atom is   



After absorbing 12.1 eV, the energy will be

            = –13.6 + 12.1 eV = –1.5 eV 


Thus, electron will jump to 3rd orbit.



The wavelength of  line of Balmer series is 6500 Å. What is the wavelength of  line of Balmer series?


The atomic spectrum of hydrogen is found to contain a series of lines at wavelengths 656.46, 486.27, 434.17 and 410.29 nm. What will be the wavelength of the next line in the series?



Calculate the energy required for the process  


The ionization energy for the H-atom in the ground state is

 2.18 × 10–18 J atom–1.


A photon of wavelength 1.4 Å collides with an electron. After collision, the wavelength of the photon is found to be 2.0 Å. Calculate the energy of the scattered electron.


If the binding energy of electrons in a metal is 250 kJ mol–1, what should be threshold frequency of the striking photons?


What is the minimum uncertainty in the position of a bullet of a mass 5g that is known to have a speed somewhere between 550,00000 and 550,00001 ms–1?



When would de Broglie wavelength of a moving electron become equal to that of a moving proton? Mass of electron =

 9.1095 × 10–31 kg and mass of proton = 1.6725 × 10–27 kg.  



How fast is an electron moving if it has a wavelength equal to the distance it travels in one second?

(mass of electron = 9.1 × 10–31 kg) 


Nitrogen has the electronic configuration  and not  which is determined by



The valence shell electron of sodium has the quantum numbers