Definition of "ů¹"?

Question

this is read "angstrom to the negative 1 power"

associated with physics

Answer 1

1 angstrom = 1.0 × 10-10 meters

Å-¹ = 1/Å

Answer 2

Whenever in physics you have a unit to the -1 power, it means "per that unit"

For instance, you can write 100 m/s as 100 ms-1.

So in your case it means "per angstrom".

Note this also works for higher powers too (like in the case of acceleration):

100 ms-2 is "100 meters per second squared"