Question

The energy required to excite a hydrogen atom from n = 1 to n = 2 energy state 10.2 eV. What is the wavelength of the radiation emitter by the atom when it goes back to its ground state?

Solution

Correct option is

1220 Å

Given, 

    

Therefore, frequency emitted radiation is   

        

and wavelength is 

        

           

           

             

           = 1220 Å.

SIMILAR QUESTIONS

Q1

A proton, when accelerated through a potential difference of V volts, has a wavelength  associated with it. If an alpha particle ius to have the same wavelength , it must be accelerated through a potential difference of

Q2

A proton and an electron move with the same velocity. The associated wavelength for proton is

Q3

Two particles of masses m and 2m have equal kinetic energies. Their de Broglie wavelength are in the ratio of 

Q4

The wavelength of de Broglie wave associated with a thermal neutron of mass m at absolute temperature T is given by (here k is the Boltzmann constant) 

Q5

The momentum of a photon of frequency v is

Q6

Which energy state of the triply ionized beryllium (Be+++) has the same electrons orbital radius as that of the ground state of hydrogen? Given Zfor beryllium = 4.

Q7

Which energy state of doubly ionized lithium (Li++) has the same energy as that of the ground state of hydrogen? Given Z for lithium = 3.

Q8

The total energy of the electron in the first excited state of hydrogen is –3.4 eV. What is the kinetic energy of the electron in this state?  

Q9

The energy of the electron of hydrogen orbiting in the stationary orbit of radius rn is proportional to

Q10

The ionisation potential of the hydrogen atom is 13.6 eV. Its energy in n = 2 energy state is