Physics Past Questions and Answers

Which of the following substances is not an insulator?

When an atom loses or gains a charge, it becomes an

In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material

The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)