Question

Solve q. No. 4 please

Answer 1

A1+A2+A3=0


WELL I DONT HAVE WORDS TO EXPLAIN IT

Answer 2

4. b) is the answer.
As the transition is from C to A in two ways but the total energy emitted from C to A will be equal to the energy emitted from C to B and then B to A
So using energy formula
1/λ3 = 1/λ2+ 1/λ1
1/λ3= (λ1+ λ2)/λ1λ2
λ3= (λ1λ2)/λ1+λ2

Therefore b) option is the correct answer.