An isotope has a half-life of 25 days. If you start with 50 grams, how much of the substance will remain after 50 days? *

25 grams

12.5 g

6.75 g

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

3. which is not a primary color of light? blue red green yellow