Question

A certain radioactive element a has a half life =t sec .In (t/2) sec the fraction of intial quantity of element so far decayed is nearly

Answer 1

These answers are correct. An example is uranium,, over time, becomes lead. The gas it gives off as it decays is called radon. It can seep up from the ground into your house and has the equivalent cancer-causing ability as smoking 2 packs of cigarettes a day. Everyone should live on a concrete slab or have the under house vent up a pipe to get rid of the radon. Also you can get a radon test. heavy elements, gold, lead, uraniun all are created by Super Nova implosions. The force is so great it causes great quanities of protons and neutrons to stick together.