Question

Match list -1 (Fundamental experiment) with list-2 (its conclusion) and select the correct option from the choices given below the list

List I	List II
(A) Franck-Hertz Experiment	(i) Particle nature of light
(B) Photo-electric Experiment	(ii) Discrete energy level of atom
(C) Davison Germer Experiment	(iii) Wave nature of electron
(iv) Structure of atom

a) (A)- (i), (B)-(iv), (C)-(iii)
b) (A)- (ii), (B)-(iv), (C)-(iii)
c) (A)- (ii), (B)-(i), (C)-(iii)
d) (A)- (iv), (B)-(iii), (C)-(ii)

Answer 1

In the above question we are given the list of experiments and their conclusion. First we need to know each of the experiments in list 1. Further accordingly we can determine the conclusion and select the correct alternative from those provided.

Complete step-by-step solution:
The Franck Hertz experiment was the first electrical measurement to show the quantum behavior of the atoms. They discovered that when an electron collided with a mercury atom, it could lose a specific quantity of energy before flying away. This proved that the electrons inside the atoms exist in or occupy certain energy levels called the quantum energy levels.
The phenomenon of emission of electrons from a metal surface, when an electromagnetic radiation of sufficiently high frequency is incident on it, is called photoelectric effect. Considering the wave nature of light, such a phenomenon could not be explained. Hence the experiment came to a conclusion that the light also exhibits particle nature as well.
The Davisson and Germer experiment used their experimental set up to measure the intensity of the scattered beam as a function of scattering angle. They observed that at a particular angle the intensity was maximum, due to constructive interference of electrons. Hence electrons also exhibit wave nature.
Therefore from the above information we can conclude the correct answer of the above question is option c.

Note: It is to be noted that there are also a wide range of other experiments which have similar conclusions. The conclusions drawn are from the facts that match with the theories or not. The structure of an atom was first proposed formally by Rutherford’s experiment.