Question

Calculate the wavelength of the spectral line when
an electron jumps from n = 7 to n = 4 level in an
atom of hydrogen.
​

Answer 1

Answer:V

=R[  

x  

1

2

​  

 

1

​  

−  

x  

2

2

​  

 

1

​  

]

=109677[  

4  

2

 

1

​  

−  

2  

2

 

1

​  

]cm  

−1

 

[Here R=108677 cm  

−1

,x  

1

​  

=4;x  

2

​  

=2

=20564.4 cm  

−1

]

λ=  

V

1

​  

=  

20564.4

1

​  

 

=486×10  

−7

cm

=486×10  

−9

cm

=486 nm.