How does a seismograph work? Choose all that apply. How does a seismograph work? Choose all that apply. A seismograph works by suspending a weight from bedrock, which moves during an earthquake. A rotating drum that is affixed to stationary bedrock records the relative displacement between the moving weight and the rotating drum. A seismograph can measure P waves, S waves, and surface waves. A seismograph works by suspending a weight from bedrock, which remains motionless during an earthquake. A rotating drum that is affixed to the moving bedrock moves as the rock moves, recording the relative displacement between the stationary weight and the rotating drum. A seismograph can measure only surface waves. A seismograph can measure both horizontal displacement and vertical displacement with the same unit.

A seismograph works by suspending a weight from bedrock, which moves during an earthquake.A rotating drum that is affixed to stationary bedrock records the relative displacement between the moving weight and the rotating drum.A seismograph can measure P waves, S waves, and surface waves.A seismograph can measure both horizontal displacement and vertical displacement with the same unit.

Explanation:

A seismometer is an instrument that seeks to measures the ground motions throughput the earthquakes, volcanic eruptions, and the explosions and is combined with the timing devices and the output of a device is recorded on the paper and that helps in the internal study of the earthquakes. The seismometer is sensitiveness to the up and down motion of the earth when a weight hanging from the spring moves along the weight displaced thus recording the ground, motion and the frame provides a vertical ground motion and can record the ground shaking through both the horizontal and the vertical displacements and records all the three waves.

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The correct answer is:   [b]:   "physical systems" .