what is the working of seismograph give answer in step
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Answer:
The ultrasound machine transmits high-frequency (1 to 5 megahertz) sound pulses into your body using a probe.
The sound waves travel into your body and hit a boundary between tissues (e.g. between fluid and soft tissue, soft tissue and bone).
Some of the sound waves get reflected back to the probe, while some travel on further until they reach another boundary and get reflected.
The reflected waves are picked up by the probe and relayed to the machine.
The machine calculates the distance from the probe to the tissue or organ (boundaries) using the speed of sound in tissue (5,005 ft/s or1,540 m/s) and the time of the each echo's return (usually on the order of millionths of a second).
seismograph are security mounted to the surface of the earth, so when the ground starts shaking, the instrument status Moves.
what doesn't move, however, is a suspended mass is inside the seismograph, called the seismometer. during an earthquake, seismometer remains still while the case around it moves with the ground shaking.
traditionally, the suspended mass was a pendulum,but most modern seismometers work electromagnetically.