What is the wavelenth of the `0.186 MeV` gamma- ray photon emitted by radium `._(88)^(226) Ra`?

A gamma - ray photon is emitted

A y-ray photon is emitted

Which noble gas may be obtained from ""_(88)^(226) Ra ?

Why does a nucleus emit a gamma -ray photon?

The alpha particles emitted by radium have energies of 4.777MeV and 4.600MeV .What is the wavelength in pm of the gamma rays accompanying the decay? The difference in energies of alpha particle emitted out is equal to the energy of gamma rays.Report your answer to nearest integer. (h=6.626times10^(-34) Joule.sec,charg "]

Which noble gas is obtained as a decay product of radium (Ra_(88)^(226)) ?