Radioactivity was discovered by Henri Becquerel in 1896, while using naturally fluorescent minerals for the study of x-rays.Radioactivity is the particle that emit from the nucleus as the result of nuclear instability.
We all love sunlight. Ever thought about how sunrays reach to us? It is through radiation. Sun rays travel through space and reach out to us. Radiation is defined as emission and transmission of energy from one source to receiver, in the form of waves or particles, through space, vacuum or any material medium.