NEET Questions Solved

NEET - 2017

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is 

(a)2

(b)1

(c)4

(d)0.05

(c) Wavelength of spectral lines are given by 

              1λ=z2R1n12-1n22

For last line of Balmer series,  

       n1=2 and n2=

     1λB=z2R122-12=R4         z=1

similarly,for last line of Lyman series,

              n1=1 and n2=

         1λ2=z2R112-12=R

       1λR1λL=4R=14

    λLλB=14 λBλL=4

 

 

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