A beta particle emitter is Cobalt - 60. Cobalt - 60 decays to Nickel in an exited state. Then gamma rays are emitted to bring Nickel to its ground state.

Discuss how you would use a Beta-particle source to investigate the penetration limits of beta-particles in the laboratory.

Which of these two sources, strontium-90 or cobalt-60, would be more suitable to
use for the penetration experiment above. Justify your answer.

Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.

Explanation:

We study the various atomic models in our course of study because, it is important for us to know, how did people come to the present concept of an atom. How did physics evolve from classical to quantum physics.

All these are important for us to know and thus, knowledge about various atomic models, their discoveries and drawbacks and finally improvements based on scientific evidence present at that time is important for us to understand the underlying theory very well.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.