A radioactive source 's activity falls from 8:000 counts per minute to 500 counts per minute in
20hours. What is the half-life of the source?
ou

vapour or gas assuming atmospheriv pressure

radiation

explanation:

heat is transmitted by radiation

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min