Why can a cell tower give me a signal hundreds of yards away, but my WiFi antenna won’t go through my bathroom wall?
Different frequencies have different propagation properties. Some signals are absorbed by wood and plaster board while others will pass right through them. Radio waves are light, and just as you can absorb, reflect, diffuse, and scatter light, so too radio waves.
The Short Answer
Different frequencies have different propagation properties. Some signals are absorbed by wood and plaster board while others will pass right through them. Radio waves are light, and just as you can absorb, reflect, diffuse, and scatter light, so too radio waves. With enough energy you can "shine" your wifi bright enough to be visible through the wall. This is why 802.11 (a through n WiFi) at 2.4 GHz will generally cover a house, but 802.11ac (which has a second 5 GHz channel) is line-of-sight. As an interesting footnote, some incredibly low frequencies have great propagation even at low frequencies. It's a sort of competition or bragging rights between HAM radio operators who participate in this sort of thing. I've heard of people sending Morse code nearly half way across the world on 1/4 Watt. Keychain flashlights consume more than that.
Analysis
Key Concepts: Frequencies, radio, different
This explanation focuses on frequencies, radio, different and spans 136 words across 9 sentences. At 89% above the average Biology explanation (72 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.
What This Answer Covers
The explanation opens with: “Different frequencies have different propagation properties.” It then elaborates by presenting a contrasting perspective, ultimately building toward a complete picture across 9 connected points.
How This Compares in Biology
Ranked #51 of 500 Biology questions by answer depth (top 11%). This places it in the comprehensive tier — the top quarter of most thoroughly answered questions. Questions at this depth typically involve multi-faceted topics requiring nuanced explanation.
Frequently Asked Questions
Is there a simple explanation for why a cell tower give me a signal hundreds of yards away, but my wifi antenna won't go through my bathroom wall?
Different frequencies have different propagation properties. Some signals are absorbed by wood and plaster board while others will pass right through them. Radio waves are light, and just as you can absorb, reflect, diffuse, and scatter light, so…
How detailed is this explanation compared to similar Biology questions?
This is one of the most thorough answer at 136 words, ranked #51 of 500 Biology questions by depth. The key concepts covered are frequencies, radio, different.
What approach does this answer take to explain a cell tower give me a signal hundreds of yards away, but my?
The explanation uses contrasting perspectives across 136 words. It is categorized under Biology and addresses the question through 1 analytical lens.