Electrical Engineering - Time Response of Reactive Circuits - Discussion

35khz is right because fall time means fall up to 50% magnitude.
So total time is 10 +10+10 = 30us.

So 1/30u = 33.33khz.
Which is approx 35khz.

Tr = 1/π f.

Using this formula we get 31.8KHz approx to 35kHz.

Rise Time/Fall Time. Rise time refers to the time it takes for the leading edge of a pulse (voltage or current) to rise from its minimum to its maximum value. Rise time is typically measured from 10% to 90% of the value.

So the extra time required to get 10% value can be any value.

If we consider it as say 5 us then also we get 40kHz so, this might be the reason that, maximum frequency form given options will be 35kHz.

tr=10microsec,
tf=10microsec,
BW=Fh+Fl=Fh,
BW=.35/tr=Fh,
Therefore;
BW=.35/10x10-6=35khz=Fh.

Bandwidth= k/rise time.

Where k is a value between 0.35 and 0.45 depending on the shape of the oscilloscope frequency curve and pulse rise time response.

Oscilloscope with bandwidth< 1GHz typically have a value of 0.35, while oscilloscope with a bandwidth of >1GHz usually have a value between 0.40 and 0.45.