* It depends on where you are: The noise level varies significantly depending on your distance from the plane and your location relative to the engines.
* Engine type and configuration: Different 747 models have varying engine types, and even within a model, the number of engines and their thrust can change.
* Takeoff/landing vs. cruise: The noise is much louder during takeoff and landing when the engines are at full power. In cruise, the engines are quieter.
Here are some general ranges:
* Takeoff: The noise level can reach 130-140 decibels (dB) at close proximity, which is comparable to a rock concert or a jet engine at full throttle.
* Landing: Similar to takeoff, noise levels can reach 120-130 dB close to the plane.
* Cruise: At higher altitudes, the noise level is significantly reduced, usually around 80-90 dB for passengers inside the cabin. This is comparable to a busy street or a loud conversation.
For perspective:
* 0 dB: The threshold of human hearing.
* 60 dB: Normal conversation.
* 80 dB: City traffic.
* 100 dB: A motorcycle.
* 120 dB: A rock concert.
* 140 dB: A jet engine at full throttle.
Important note: Prolonged exposure to noise levels above 85 dB can cause hearing damage.
