1. the probability of finding any one particular electron on any

[Helicobacter]

1. the probability of finding anyone particular electron on any finite interval in the universe is nonzero...does that imply that a string is as long as the universe?

2. why do strings only vibrate at certain frequences?

 

[dpa]

I have not had any course or study, but here's my commonsense, not necessarily right.

2. why do strings only vibrate at certain frequences?
-May be they have something like natural frequence associated with their certain properties.
-Or the frequency is itself quantised like the energy levels in atoms because energy is associated with the frequency.