Discussion
A seismogram is sampled at 100 samples per second. The time interval between samples is
Answer: C
Correct answer: 0.01 s
The sampling interval is the reciprocal of the sampling rate:
\[ \Delta t = \frac{1}{100} = 0.01 \text{ s} \]By the Nyquist criterion this record can faithfully represent frequencies up to 50 Hz, half the sampling rate, and anything above that must be removed by an anti-alias filter before digitising or it will be folded back into the band and corrupt it.
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