Measuring waveform amplitude and frequency on CRO

Steps:

• Count peak-to-peak vertical divisions (assume 3 div from diagram); multiply by y-gain: 3 × 1 V/div = 3 V amplitude.
• Count horizontal divisions for one full period (assume 2 div from diagram); multiply by time base: 2 × 2 ms/div = 4 ms period.
• Calculate frequency: f = 1/T = 1/(4 × 10^{-3} s) = 250 Hz.
• Compare to options: 3 V and 250 Hz matches B.

Why B is correct:

• Amplitude is peak-to-peak voltage (3 V) per CRO y-scale; frequency follows f = 1/T from time base period (4 ms).

Why the others are wrong:

• A: Correct amplitude but frequency halved (period misread as 8 ms).
• C: Amplitude doubled (full height mismeasured); frequency halved.
• D: Amplitude doubled; correct frequency.

Final answer: B