The instrument used for measuring the magnitude of seismic waves is known as

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Seismograph

Pantograph

Richter scale

Pendulum

answer is A.

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Detailed Solution

The instrument used for measuring the magnitude of seismic waves is known as Seismograph.
A seismograph helps to record the seismic waves caused during an earthquake. A seismograph comprises of a vibrating rod or a pendulum and a sheet of paper fixed to a base. The rod or pendulum starts vibrating when tremors occur. A pen is attached to the end of the pendulum. The pen records the tremors on paper, which also moves due to the tremors. Hence, a seismograph is an instrument for measuring the magnitude of seismic waves.

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