I think it's A electrical impulses from the ear
Since you did not enumerate the features to choose from, I'll just give you a brief information about acidic water.
>Acidic water<span> has a pH below 7 or less than 7.0.
</span>> Acidic water can dissolve a limestone rock.
> The <span>land features which are formed in limestone by reaction with acid water are the stalactites and the stalagmites.</span>
Explanation:
It is given that,
Frequency of vibration, f = 215 Hz
Amplitude, A = 0.832 mm
(a) Let T is the period of this motion. It is given by the following relation as :
(b) Speed of sound in air, v = 343 m/s
It can be given by :
Hence, this is the required solution.
13.1 km/s, that is the mean orbital velocity of Jupiter around the sun
D- Volume I may be wrong but hopefully I’m right