🔍 Key Concepts

• Signal-to-noise ratio (SNR) in communications/electronics • Difference between signal level vs. distance vs. frequency • How background noise affects the ability to detect or understand a signal

💭 Think About

• Ask yourself: when radio or radar technicians talk about SNR, are they usually comparing how far away something is, how strong it is, or what frequency it is on? • Which option best matches what you would adjust (or measure) to improve clarity of reception: the strength of the signal, the distance to the source, or the operating frequency? • Think about volume on a radio: when someone says the "signal" is weak compared to the "noise," what exactly are they comparing?

✅ Before You Answer

• Identify which choices describe a comparison of levels (strength/intensity) rather than distance or frequency. • Eliminate any options that do not clearly relate to how strong the desired signal is relative to background noise. • Check that the correct choice could be expressed as a ratio (one quantity divided by another) that makes sense for signal clarity.