If an electron in a hydrogen atom jumps from an orbit of level $n=3$ to an orbit of level $n=2$,then the emitted radiation frequency is (where $R=$ Rydberg's constant,$C=$ velocity of light).
- A$\frac{3RC}{27}$
- B$\frac{RC}{25}$
- C$\frac{8RC}{9}$
- D$\frac{5RC}{36}$
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