How can everyone in a large crowd hear the speaker from a long distance away?
I always wonder about this particular scenario, where in a large area, the lead speaks and all of the audience listen although they are quite far away. In some motivational speeches, the army commander speaks from a long distance and the soldiers get encouraged and respond to it.
This can be observed in many movies/series like:
In Game of Thrones S08E06, "The Iron Throne", Daenerys' speech be audible to everyone. Also in previous episode, Missandei's words were audible for Dany and her army?
In Lord of the Rings: The Two Towers, during Saruman's speech to all the orcs, Even though Saruman is at the top of the tower his words/voice wouldn't naturally be discernible from hundreds of feet away.
Best Answer
There are three potential approaches here.
The leader's voice carries due to geography/technology/psychic connection
People in the front ranks can turn around and tell those behind what's going on
(more usually), the ranked masses pretty much understand what's going on and simply yell and stamp their feet when the people in front do
In terms of actually valuable knowledge, this comes in the smaller briefings that come afterward where operational leaders brief their underlings.
Or the entire army marches off to undoubted glory without really needing to know the details.
Pictures about "How can everyone in a large crowd hear the speaker from a long distance away?"
How far does speaker sound travel?
We know that sound travels at approximately 1130 feet per second, so we can calculate how many wave cycles that is for the 60 Hz wave. We divide 1130 by 60, and the result is around 19 feet (18.83 if you want to be anal about it). We can now deduce that each wave cycle is 19 feet apart.How does directional sound work?
Summary of how directional speakers work When the two waves hit something (or someone), they slow down and demodulate, producing a new wave (green) whose frequency is much lower\u2014equal to the difference in frequencies between the two original waves. This is a wave you can hear.How do parametric speakers work?
Parametric speakers, also commonly referred to as directional speakers, are a unique variety of speakers which use ultrasonic waves to reproduce sound. The ultrasonic waves have a shorter wavelength, hence this variety of speaker produces more directional sound than conventional speaker systems.Can sound be projected?
Researchers have developed technology that can project a beam of sound so narrow that only one person can hear it. "Directed" audio sounds like it's coming from right in front of you even when transmitted from a few hundred meters away.More answers regarding how can everyone in a large crowd hear the speaker from a long distance away?
Answer 2
In reality, MAYBE YES
I said maybe because it will need ideal conditions as discussed in this Physics SE answer and this Guiness World Record.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: SHVETS production, John Diez, Nothing Ahead, Mustafa Kılıç