When a politician makes a speech that is televised and...

When a politician makes a speech that is televised and transmitted live, who hears his words first? 1) a person in the crowd in front of the politician, listening from 50m away OR 2) a person watching the televised recording from 3000km away, with his ear right up against the television set? Select the correct answer Because light travels faster than sound. The column resonates with the sound waves more than with the light waves The column can transmit sound waves but not light waves. Sound waves have much longer wavelengths than light waves and therefore are more able to bend around the column. Your Answer Sound waves have much shorter wavelengths than light waves and therefore are more able to bend around the column

Transcript

00:01 All right, so we have a potentially confusing problem if you don't look at the wording carefully.

00:05 But we have a press conference with a politician here, and the sound is coming from, you know, the microphone or the speakers or their voice.

00:15 I think in this case it's their voice.

00:16 And it's picked up by a reporter, and let's say they have a microphone here.

00:22 It's picking up the sound.

00:24 And then this sound and the picture is transmitted to some camera, which is then broadcast using em waves.

00:34 I'll use a different color for that.

00:37 A long distance until it is picked up by, whatever mechanism that produces it, the image on the tv screen, and the sound then comes out of the tv and is picked up by somebody watching tv.

00:52 So basically the idea is that this reporter is standing a certain distance away from the original sound source, and this person is sitting a certain different distance away from the television sound source and we're told that actually due to the parameters of this problem they hear the reporter and the person sitting watching tv hears the sound at the same time and so we're basically asked to determine then what must this distance be um or what's the maximum distances could be for this to be true so the way to look at this is that the time it takes for this sound to reach this person plus the time it takes for the sound to reach this reporter has to be equal to the time it takes for the signal to be broadcast and then the sound to reach this person so it's the time it takes light to travel this distance plus this time it takes sound to travel this distance that has to be equal to this time so what is this time equal to well it's just the distance the reporter is at divided by the velocity now the velocity is the speed of sound what is this time well it's going to be the maximum distance that this light has to travel divided by the speed of light plus this distance um to the person so i should this would be like the distance to the reporter this will be the distance to the viewer i guess so this is our reporter this is our viewer and it's the same speed of sound presumably all right and and so we want to know these two things have to be equal to each other, right? so what we have is the distance to the reporter divided by the speed of sound is equal to the maximum distance that the viewer can be away from the broadcast plus the distance to the viewer from the television screen divided by the speed of sound...

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