The half-life for the radioactive decay of u-238 is 4.5 billion years and is independent of initial concentration. how long will it take for 10% of the u-238 atoms in a sample of u-238 to decay? if a sample of u-238 initially contained 1.5×10181.5×1018 atoms when the universe was formed 13.8 billion years ago, how many u-238 atoms does it contain today?

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot