Numerical Problems | Chapter 21 Nuclear Physics | 10 Physics | NBF New Book FBISE

Описание: Numerical Problems | Chapter 21 Nuclear Physics | 10 Physics | NBF New Book FBISE
Polonium 〖_84^209〗"Po"is a radioactive nuclei. Determine number of protons, number of neutrons and number of nucleons in it.
2.Americium 〖_95^241〗"Am" undergoes alpha decay and produces an alpha particle. Write down the chemical equation for it and name the nucleus formed.
3.A radioactive substance has a half-life of 16 months. In how much time, one-eighth of the substance will be left?
4.In a nuclear reaction, 2 µg of mass is converted into energy. Find the energy
5.In 420 days, one-eighth of polonium (Po) remains un-decayed. Calculate the half-life of polonium?
6.The half-life of radium is about 1600 years. In how much time, 250 g will remain un-decayed when 1 kg of radium was there initially?
7.Three-fourth of the initial mass of a certain radioactive isotope decays after one hour. Find half-life of isotope in minutes?
8.The half-life of 〖_83^210〗"Bi"is 5 days. If we start with 64,000 nuclei of this isotope then how many number of atoms will left after one month?
9.An archeologist digs up a human skull at a dig site. It was found that concentration of carbon-14 with a half-life of 5730 years is 25% of its initial concentration. What is the age of the skull?
10.The C-14 content with a half-life of 5730 years of an ancient piece of wood was found to have three tenths of that in living trees (indicating 70% of the C-14 had decayed). How old is that piece of wood?