Who heard the voice of the host first, the audience in front of the TV or the audience in the studio?

Some people's answer is in front of the TV. According to the physical explanation, the audience in front of the TV can hear it first. I learned in the physics class of junior two that the sound heard by the audience sitting in the studio is transmitted through the air, while the sound heard by the audience sitting in front of the TV is transmitted through electromagnetic waves. Electromagnetic waves travel faster than air, so the audience in front of the TV is the first to hear them. In air, sound travels 340 meters per second, while electromagnetic waves travel 30 million meters per second. You can do the math. If interpreted according to the actual situation, the answer is that the audience at the scene heard it first, because the current live TV advertisement has been time-shifted by some equipment, which is about 30 seconds-1 minute later than the scene, plus the transmission processing time, which is much later than the live sound.

Time is to delay the playing time of the transmission device. If there is an accident, such as criminals playing anti-hole slogans or shouting reactionary slogans, they can stop broadcasting in time. The audience will see the subtitles or flower arrangement of "Sorry for the interruption of the signal". This is for the need of stability, and now radio and television in all countries are using this technology.