From Ancient to Modern Indian History, Indian subcontinent encounter by foreign travellers and some of them left valuable accounts of their travels. These foreign accounts gave us a valuable objective document that will help us to understand the social-political-economic condition of a particular era. These travellers account cannot be understood without knowing their perception of writing. Here, we are giving the list of famous travellers who visited India during reign of different rulers of Vijayanagar Empire.
An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged.
Radioactivity was gradually understood in terms of the disintegration of atomic nuclei. The three types of radiation are alpha decay, beta decay and gamma decay. Alpha radiation occurs when an unstable nucleus breaks down so as to eject a fast-moving nucleus of helium, which consists of two protons and two neutrons.
Otto Hahn and Fritz Strassman (1902-80) discovered nuclear fission in 1938. When an isotope of uranium-235 was bombarded with neutrons, it split into two lighter nuclei along with, on average, three neutrons. These neutrons were capable of bombarding and splitting other nuclei, causing more fission to take place.