Two light pulses are emitted simultaneously from a source. The pulses take parallel paths to a detector 7.65 m away, but one moves through air and the other through a block of ice. Determine the difference in the pulses times of arrival at the detector. (Assume the index of refraction of ice is 1.309.) Answer in units of ns.

The difference in the pulses times of arrival at the detector is  

Explanation:

From the question we are told that

   The distance of the detector from the source is

    The index of refraction of ice is  

Generally the speed of light is  a constant with a value  

So the time taken for the first light source through air is  

substituting value

The time taken to travel through ice is

substituting values

The in pulses time arrival is mathematically evaluated as

 substituting values

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