Discussion
A stage has a bandwidth of \( 3.5 \ \mathrm{MHz} \). Its rise time is about
Answer: A
Applying the constant product:
\[ t_{r} = \frac{0.35}{3.5 \times 10^{6}} = 100 \ \mathrm{ns} \]
giving about 100 nanoseconds. The other options misplace a decade or use the numerator directly. Because the product is a fixed number for a given response shape, either quantity can be measured and the other inferred, which is often the quicker route in a laboratory.
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