Atoms and Nucle...

The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is r_o. The distemce of the closest approach when the α -particle is fired at the same nucleus with kinetic energy 2k will be.

which of the following series in the spectrum of hydrogen ion lies in the visible region of the electron magnetic spectrum?

If 13.6 eV energy is required to ionige the hydrogen atom the energy required to remove the electron form n = 2 state is

It N_o is the original mass of the substance of halt lift 5 years, the amount of substance left after 15 years is

At a certain instant, a radioactive sample has a decay rate of 5000 dis-interation Per minute. After 5 minuter the decay rate is 1250 dis-interations Per minute. Then the decay constant is (Per-min )

A nucleus with Z = 92 emits the following sequence α, α, β^–, β^–, α, α, α, α, β^–, β^–, α, β⁺, β⁺, α. The Z of the resulting nucleus is

which of the following can not be emitted in radioactive decay of the substance?

which of the following atom has the lowest ionisation potential?

If the binding energy of electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron form the first state of Li²⁺ is.