Sound cannot travel through a

A vacuum

Explanation:

A vacuum is an area without any air, like space. So sound cant travel through it.

place without a medium (matter)

Explanation: Sound needs a medium to travel.

v 154.9= 0.9 length length s little over 154.9cm

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach