ATOMIC STRUCTURE (QUIZ-4) 1 / 5 The first use of quantum theory to explain the structure of atom was made by Heisenberg Bohr Planck Einstein The first use of quantum theory to explain the structure of atom was made by Bohr 2 / 5 All nuclides exhibit radioactivity when the atomic number exceeds 80 83 90 92 Radioactive element has atomic number > 83 3 / 5 When a radioactive substance is subjected to a vacuum, the rate of disintegration per second Increases considerably Increases only if the products are gaseous Is not affected Suffers a slight decrease Rate of disintegration does not depend upon the environmental factor 4 / 5 Which of the following orbitals does not have the angular node? 𝑝𝑥-orbital 𝑑𝑧2-orbital 𝑝𝑦-orbital 1𝑠-orbital 𝑠 orbitals are independent of angular wave function. Thus, they do not have any angular node.They have only spherical node. The number of spherical nodes in 𝑠 orbitals are given by (𝑛−1), where 𝑛 is the principal quantum number 5 / 5 Which of the following does not characterize 𝑋-rays? The radiations can ionize gases They cause ZnS to fluoresce They are deflected by electric and magnetic fields They have wavelengths shorter than ultraviolet rays X-rays are not having any charge, therefore they are not deflected by electric and magnetic fields Your score isThe average score is 56% 0% Restart quiz