Physics Past Questions and Answers

A radioactive substance has a half-life of 20 hours. What traction of the original radioactive nuclide will remain after 80 hours?

Which of the following is used a nuclear reactor to slow down fast moving neutrons?

According to the kinetic theory of gases the collision
of the molecules of a gas with the wall of the container
is mainly responsible for the l. temperature of the
gas ll. viscosity of the gas Ill. pressure of the gas
Which of the statements above is/are correct?

Eight or - particles and size B - particles are emitted from an atom of ₉₂²³⁸U before it achieves stability. What is the nucleon number of the final product in the chain reaction?

When an atom is in the ground state, it is said to be