$A$ star moves away from the Earth at a speed of $0.8\,c$ while emitting light of frequency $6 \times 10^{14} \,Hz$. What frequency will be observed on the Earth? ($c =$ speed of light)
- A$0.24 \times 10^{14} \,Hz$
- B$1.2 \times 10^{14} \,Hz$
- C$2 \times 10^{14} \,Hz$
- D$150 \times 10^{14} \,Hz$
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