POINTS PLZ HEL If you set up and completed this activity yourself, submit a picture of your seismograph, as well as a picture or scanned copy of your seismogram graph paper.

Observations

Describe what was observed in this activity regarding the seismograph.

Analysis

How do the recordings of the slow shakes compare to those when the table was shaken strongly? How would the seismogram of a magnitude 9 earthquake compare to that of a 5 magnitude? Explain your reasoning.

Compare and contrast the seismograph from this investigation with one that you saw pictured earlier in the lesson.

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it doesn't. it was imagined up in the middle ages.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.