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1)

A hydrogen atom is an exciting state of principal quantum number (n), it emits a photon of wavelength (λ). when it returns to the ground state. the value of n is 


A) λRλR1

B) (λR1)λR

C) λ(R1)

D) λRλR1

Answer:

Option D

Explanation:

As   1λ=R(1n211n22)

     1λ=R(1121n2)

 Mutliply both sides by λ

 1=λR(11n2)or1λR=11n2

 or   1n2=11λR=λR1λR

   or    n=λRλR1