The intensity of light from a continuously emitting laser source operating at $638 \,nm$ wavelength is modulated at $1 \,GHz$. The modulation is done by momentarily cutting the intensity off with a frequency of $1 \,GHz$. What is the farthest distance apart two detectors can be placed in the line of the laser light,so that they can see the portions of the same pulse simultaneously?
(Consider the speed of light in air $c = 3 \times 10^{8} \,m/s$)
(Consider the speed of light in air $c = 3 \times 10^{8} \,m/s$)
- A$30 \,\mu m$
- B$30 \,cm$
- C$3 \,m$
- D$30 \,m$
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