Plane microwaves from a transmitter are directed normally towards a plane reflector. $A$ detector moves along the normal to the reflector. Between positions of $14$ successive maxima,the detector travels a distance of $0.13\, m$. If the velocity of light is $3 \times 10^8\, m/s$,find the frequency of the transmitter.
- A$1.5 \times 10^{10}\, Hz$
- B$10^{10}\, Hz$
- C$3 \times 10^{10}\, Hz$
- D$6 \times 10^{10}\, Hz$
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