Frequency from Waveform Period Steps:

• Measure the period: one complete waveform cycle spans 2 divisions.
• Time per division is 2.0 ms, so period T = 2 × 2.0 ms = 4.0 ms = 0.004 s.
• Calculate frequency f = 1/T = 1/0.004 = 250 Hz.
• Matches option C.

Why C is correct:

• Frequency equals the reciprocal of the period (T = time for one cycle), directly from the wave equation f = 1/T.

Why the others are wrong:

• A: 63 Hz implies T ≈ 16 ms (8 divisions), but waveform shows shorter period.
• B: 170 Hz implies T ≈ 5.9 ms (≈3 divisions), but cycle is exactly 2 divisions.
• D: 500 Hz implies T = 2 ms (1 division), but cycle spans 2 divisions.

Final answer: C