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Q.

Balmer gives an equation for wavelength of visible radiation of H-spectrum as  λ=kn2n2−4. The value of k in terms of Rydberg’s constant R is

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a

R

b

4R

c

R/4

d

4/R

answer is D.

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Detailed Solution

1λ  =  R Z21n12 −  1n22.  For  H−atom  Z=1.For visible radiation, n1=2∴    1λ  =  R 12 2 −  1n 2 ⇒  λ=4n2Rn2−4=k  n2n2−4  ⇒  k=4R.
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Balmer gives an equation for wavelength of visible radiation of H-spectrum as  λ=kn2n2−4. The value of k in terms of Rydberg’s constant R is