What's the intonation of "please"-question mark?
Hey guys! Hope your day is going well. :)

Earlier tonight I found myself intoning the following sentences in such intonation patterns:
↗↗↗↘,↘?
Could you repeat that, please?
↗↗↗↗↘,↘?
Could you speak more slowly, please?
↗↗↗↗↘↘,↘?
Could you spell that for me, please?

Some words weren't right on the tones yet I wasn't fully convinced by the audio from a friend in which he suggests that "rising intonation on the word 'please'". Some rules regarding the intonation of general and specific questions were found online. I still expect one (if there's any) that fits. I'm curious how would you rearrange it? Or how do you say it in daily conversations?

"The falling intonation is said to be more often associated with completeness and definteness."

"Use the falling tone for the one-word question (asking for new information)."

Given that, the corresponding example is as follows:
"- I want to quit the job."
"- Why?"(↘)

Question

What's the intonation of "please"-question mark?
Hey guys! Hope your day is going well. :)

Earlier tonight I found myself intoning the following sentences in such intonation patterns:
↗↗↗↘,↘?
Could you repeat that, please? 
↗↗↗↗↘,↘?
Could you speak more slowly, please? 
↗↗↗↗↘↘,↘? 
Could you spell that for me, please?

Some words weren't right on the tones yet I wasn't fully convinced by the audio from a friend in which he suggests that "rising intonation on the word 'please'". Some rules regarding the intonation of general and specific questions were found online. I still expect one (if there's any) that fits. I'm curious how would you rearrange it? Or how do you say it in daily conversations?

"The falling intonation is said to be more often associated with completeness and definteness."

"Use the falling tone for the one-word question (asking for new information)."

Given that, the corresponding example is as follows:
"- I want to quit the job."
"- Why?"(↘)

Answer

After repeating the sentences over and over to check my natural intonation, I have come to the conclusion that the intonation on the "please" is very similar to the 3rd tone in Mandarin. It has a slight falling then rising sound. Also, in spoken English, there is very little, if any,  pause at the comma in "Could you repeat that, please?" It will just sound like 5 words said at about the same speed. 
     once you are used to using the "please" at the end of a polite question, it will just come natural. "Could you hold the door, please?" "May I have a refill, please?" etc.

Answer

Hi Kai,

Thank you for detailing every bits of the example sentences.

I agree with stress on the verbs. But may I ask how did you read "please" in those sentences? Was it with a raised tone?

Regarding the one-word question, I personally would read "why" with a slight raising tone at the very beginning of the word then fall by the end. It's not a straight downward. I'll pay attention to that anyway. Thank you for letting me know. :)

Answer

It depends a lot on the accent/dialect. One rule of thumb is that most sentences can be turned into sentences just by raising the intonation towards the end. However, in some accents, it is normal to speak almost every sentence with a rising intonation, so of course, this rule doesn't always apply.

When I speak the example sentences, I do find that my intonation rises towards the middle and then drops. I find that I naturally stress the verbs (repeat, speak, spell), and part of that includes a raised tone.

In the case of the one-word question, I'm the opposite. I would tend to say this with a raising intonation. Asking a one-word question with a falling intonation almost sounds aggressive or intimidating to my ears. So it depends on context.