Two light pulses are emitted simultaneously from a source. Both pulses travel to

Question

Two light pulses are emitted simultaneously from a source. Both pulses travel to a detector, but one first passes through 6.2 m of ice. Determine the difference in the pulses' times of travel at the detector. Two light pulses are emitted simultaneously from a source. Both pulses travel to a detector, but one first passes through 6.2 m of ice. Determine the difference in the pulses' times of travel at the detector. Two light pulses are emitted simultaneously from a source. Both pulses travel to a detector, but one first passes through 6.2 m of ice. Determine the difference in the pulses' times of travel at the detector.

Explanation / Answer

Index of refraction of ice = 1.309

v = c / n = c / 1.309 = 0.764 c

Time difference delta t = tglass - tair = d [1/v - 1/c]

= 6.2 * [1 / 0.764 c - 1 / c]

= 6.39 * 10-9 s = 6.39 ns

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