Photoelectric EffectHard
Question
The wavelengths of Ka x-rays of two metals ′A′ and ′B′ are 
and 
respectively, where ′R′ is Rydberg constant. The number of elements lying between ′A′ and ′B′ according to their atomic numbers is
and respectively, where ′R′ is Rydberg constant. The number of elements lying between ′A′ and ′B′ according to their atomic numbers isOptions
A.3
B.6
C.5
D.4
Solution
= R (Z − 1)2 ×
⇒
= R (Z1 −)2 
⇒ Z1 = 26and 675 R = R (Z2 − 2)2.
⇒ Z2 = 31Hence number of elements = 4
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