An excited He ion ( ) de-excites from to in two steps: first

CHEMISTRY · Single correct · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

An excited He

^{+}

ion (

Z=2

) de-excites from

n=3

n=1

in two steps: first

n=3\rightarrow2

, then

n=2\rightarrow1

. What is the ratio of the wavelengths

\lambda_{32}/\lambda_{21}

of the two photons emitted (take each as a positive quantity)? (a)

1.67

(b)

5.4

(c)

0.19

(d)

2.4