If 4 oz of a radioactive substance were stored in your car’s glove compartment, then after 12 weeks, only 3 oz of the same substance were left. What is its half-life?

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.