Match List $- I$ (Experiment performed) with List $-II$ (Phenomena discovered/associated) and select the correct option from the options given the lists
List $- I$ | List $- II$ |
$(1)$ Davisson and Genner | $(i)$ Wave nature of electrons |
$(2)$ Millikan's oil drop experiment | $(ii)$ Charge of an electron |
$(3)$ Rutherford experiment | $(iii)$ Quantisation of energy levels |
$(4)$ Franck-Hertz experiment | $(iv)$ Existence of nucleus |
$(1 )-(i), (2)-(ii), (3)-(iii), (4)-(iv)$
$(1 )-(i), (2)-(ii), (3)-(iv), ( 4)-(iii)$
$(1)-(iii), (2)-(iv), (3)-(i), (4)-(ii)$
$(1 )-(iv), (2-(iii), (3)-(ii), (4 )-(i)$
In a Geiger-Marsden experiment, what is the distance of closest approach to the nucleus of a $7.7 \;MeV$ $\alpha -$particle before it comes momentarily to rest and reverses its direction?
For principal quantum number $n = 3$, the possible values of orbital quantum number $‘l’$ are
Assertion: The specific charge of positive rays is not constant.
Reason: The mass of ions varies with speed.
In the spectrum of hydrogen atom, the ratio of the longest wavelength in Lyman series to the longest wavelength in the Balmer series is
The following diagram indicates the energy levels of a certain atom when the system moves from $2E$ level to $E$, emitting a photon of wavelength $\lambda $. The wavelength of photon produced during its transition from $\frac{4E}{3}$ level to $E$ is