A laser beam travels a distance of 52120m in 0.0002 seconds. Which one of the following is best expression (scientific notation) for the velocity of the beam?

3.84x10 -9 m/sec

3x10 +8 m/sec

2.6 x 10 +8 m/sec

3.8 x 10 -9 m/sec

3.84x10 -9 m/sec

3x10 +8 m/sec

2.6 x 10 +8 m/sec

3.8 x 10 -9 m/sec

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