Unverified50% confidenceFactExact time

For an airplane moving in a straight line at constant speed, the Doppler curve of its engine sound appears as a smooth S-shaped curve.

Sources

50%

Confidence

Long-term

Relevance

11/3/2026

First Seen

Sources

Stable URI

https://kongchang.com/claim/1131740

API

curl https://kongchang.com/api/v1/knowledge/claims/1131740

MCP

get_claim(id=1131740)