Question

One stockbroker is across the country (4500 km) from the trading floor while the other is right on the floor. How much of a time delay is there for the remote stockbrokers’ order if the order is transmitted on waves traveling at the speed of light. (The answer is small but it matters.)

A large water wave is created 1000km from shore. How much warning can the shore community get before the wave hits. Assume the warning is transmitted on light waves so the warning can get to the coast much quicker than the water wave. So just calculate the time the water wave takes to get to shore.   On the West Coast, Oregon beaches have tsunami warning instructions and there is a system to warn of incoming dangerous waves.

Answer 1

Time delay for stockbroker

= Distance / Speed of light wave

= 4500 km / 3*10^5 km/s

= 0.015 seconds or 15 ms (ANSWER)

Time taken by shore community to receive warning

= Distance / Speed of light wave

= 1000 km / 3*10^5 km/s

= 0.0033 seconds or 3.3 ms (ANSWER)

Time the water wave takes to get to shore

= Distance / Speed of water wave

= 1000 km / 50 km/h (Note: Avg. speed of Tsunami water wave near land is 50 km/h)

= 20 hours (ANSWER)

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