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NIKHIL GARG Grade: 12
        

An electron in a hydrogen atom in its ground state absorsbs twice its ionisation energy. What is the wavelength of the emitted electcron ?

6 years ago

Answers : (2)

Srinivas Rao
11 Points
										

The ionisation energy of hydrogen is 21. 72 x 10-19 J


So, energy supplied to the electron is 2x 21.72 x 10-19 J. To knock the electron out of atom, it needs 21.72 x 10-19 J. The remaining energy of 21.72 x 10-19J appear as kinetic energy.


K.E = 1/2 mv2   or 2 K.E = mv2   or  v = (2K.E / m)1/2


Wave length = h / mv


Wave length = h / (2 K.E. m)1 = 1 x 10-19 m


 

6 years ago
Ravi Malhotra
9 Points
										

Formula is    -13.6Z2/N2 EV/atom


Use this to find ionisation energy (as it is equal to total energy)


 


Then use E= hc/λ


 


You will get the answer.

6 years ago
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