Why do all languages share the same intonation for questions?
I could be wrong here, but it seems to me that a common aspect amongst all languages is the tendency to raise the pitch of your voice slightly when asking a question. Especially at the end of a question sentence.
If I'm wrong about this raised pitch being common amongst all languages, at the very least do all languages change their tone slightly to indicate that a question is being asked?
I guess there needs to be some way to indicate what is and isn't a question. Perhaps a higher pitched voice reflects uncertainty. Is this something deep rooted in humans, or just an arbitrary choice when language developed?
"Rhetorical" questions - like this one - are specially interesting because, while they follow the syntax of a genuine question, they're pragmatically assertions. You're implying "this is not true", even if you're phrasing it as a question.
And that phrasal pitch contour that you see in yes/no questions is dictated by the pragmatical purpose of the utterance, so if the "question" is not actually a question, it doesn't get it.
Serious now, this sentence is a great example because, even if phrased as a yes/no question, you'll typically see it being used as a request - "please tell me more". And as such you'll often hear it without the higher pitch associated with yes/no questions.
They seem to have a rise-drop, at least when I say them.
"How old are you?" is interesting because the rise is on the third-last word ("old"). But "How old is your daughter?" has the rise in the first syllable of daughter.
I wonder if it's more because we frame the question by altering the structure to indicate the appropriate response.
We could just as well ask "you are from where?" Or "your name is what?" That matches the expected sentence structure of a response, and the natural pitch rises.
The first two have emphasis that imply something different than a simple question. Like you are asking a bunch of people individually, and you are directing each question at a specific person.
The last one would maybe be like, if the person did something weird, and you were sarcastically asking where the are from, to imply that they were raised by wolves, or something like that.
Point being, yes, you can ask like that, but it has different connotations than a simple question, which I think is where you would use the rising intonation.
Do you really pronounce those with a higher pitch? Or do you pronounce them louder?
EDIT: that is a genuine question given that a lot of people conflate stress (louder; more dB) with pitch (higher tone; more Hz), and the examples provided hint prosodic stress, not prosodic intonation, since in English prosodic stress is often used for emphasis.
I guess in this example, "who is your daddy?" Is the main question, which has a somewhat flat intonation, but contrasted to the emphasis in the second half of the sentence, it feels like a rise