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E2B10:What aspect of an analog slow-scan television signal encodes the brightness of the picture?

E2B10E2B

What aspect of an analog slow-scan television signal encodes the brightness of the picture?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E2B10 is Tone frequency.

The key fact is Tone frequency. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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