After the collision of two H atoms each atom emits a photon of wavelength 121.6 nm which transition leads to this wavelength ?how fast were the hydrogen atoms travelling before collision?(Mass of H atom=`1.69xx10^-27`kg)

Wavelength of a particular transition of H atom is 400 nm. What an be the wavelength of He^(+) for the same transition-

How many photons are emitted in the transition of the electron from the fourth to the first energy level of H-atom?

Hydrogen atoms in the ground state are excited by means of radiation of wavelength 1026 Å. Find out the wavelength of radiation that this excited atoms can emit when they come back to ground state. Given, h=6.625xx10^(-34)J*s,c=3xx10^(8)m*s^(-1), 1 eV =1.6xx10^(-19)J ionisation energy of hydrogen = 13.62 eV.

What element has a H like spectrum whose lines have wavelength four times shorter than those of atomic hydrogen?

An electron is revolving in the third orbit of a hydrogen atom. What is its angular momentum? [h = 6.6 xx 10^-34 JS]

What will be the wavelength of the light emitted due to a transition of electron from n=3 orbit to n=2 orbit in hydrogen atom ? Given : in the Rydbeg constant for hydrogen atom is R_H=1.09xx10^(7) m^(-1) .

What is highest frequency of the photon that can be emitted from H atom?What is the wavelength of this photon?

In case of hydrogen atom, calculate the wavelength of K_(alpha) line. Given energy of hydrogen atom in ground state =-13.6 eV,h=6.63xx10^(-34)j*s .

Calculate the wave length in.angsfrom of the photon emitted when an electron returns to 2nd orbit from third orbit in the hydrogen atom. Given ionisation energy of hydrogen = 2.17 xx 10^(-11) erg /atom , h = 6.62 xx 10^(-27) erg sec.

Electron of a hydrogen atom revolves in 3rd orbit. Find the angular momentum of the electron. (h=6.6xx10^(-27) erg*s)