#### Question

If the speed of light is 3.0 ×10^{8} m s^{-1}, calculate the distance covered by light in 2.00 ns.

#### Solution

According to the question:

Time taken to cover the distance = 2.00 ns

= 2.00 × 10^{–9} s

Speed of light = 3.0 × 10^{8} ms^{–1}

Distance travelled by light in 2.00 ns

= Speed of light × Time taken

= (3.0 × 10^{8} ms ^{–1}) (2.00 × 10^{–9} s)

= 6.00 × 10^{–1} m

= 0.600 m

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Solution If the speed of light is 3.0 ×108 m s-1, calculate the distance covered by light in 2.00 ns. Concept: Uncertainty in Measurement - Scientific Notation.