If a system is in a quantum pure state |a> then would the expected value be the eigenvalue? meaning if we know that the system is in the pure state |a> , then can we predict exactly the outcome of the measurement of the observable x ? which is ?

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

365.25 earth days are in the year of a light year