Question

Standing at a distance, how is it possible to detect​

Answer 1

Answer:

you are able to detect as your mind has met it before and ❤❤ and trues to recognize and ⭐O and imagine your girlfriend is at a distance in a market you will think and recognize her from distance also

Explanation:

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Answer 2

Answer:

As the bottles fills up,the amount of air inside the bottle decreasese ,The amplitude or the loudness of the sound decrease,as the amount of air column vibrating decreases as the bottles flips up . So with the increase in shrillness of the sound,you can detect the filling up of the bottle