I looked up the half life for nickel-63 and then used the half life formula which is No=Nt*e^(kt) so the final answer is 20000 years for 26g of nickel-63 to decay to 6.5g
Answer:
3.4g of Al
Explanation:
you would need to start with 3.4 g of Al
I think there are two choices that would be correct. The ideas by the Ancient Greeks that is least partially supported by scientific experiments are light is a stream of rays that comes with great velocity from the eyes of an observer and it is the result of rays that leave the eyes, reflect off an object, and interact with sunlight to become visible. It was the Greeks who laid out basic laws about reflection and refraction where they found that the angle of incidence is the same as the angle of reflection. They thought light rays came from the eye and that it travels towards the object which results to the objects as visible. This was called the concept of intromission.<span />