Plutonium-32 has a half-life of 14.2 days. How many half-lives have passed in 99.4 days?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

Which composition of water moves to begin a deepwater current?