Match List ‐ I (Experiment performed) with List ‐ II (Phenomena discovered/associated)and select the correct option from the options given below the lists List-I List-II ( a ) Davisson and Germer experiment i Wave nature of electrons b Millikan's oil drop experiment ii Charge of an electron c Rutherford experiment iii Quantisation of energy levels d Franck-Hertz experiment ( iv ) Existence of the nucleus

( a ) ‐ ( i ) , ( b ) ‐ ( ii ) , ( c ) ‐ ( iv ) , ( d ) ‐ ( iii )

( a ) ‐ ( iii ) , ( b ) ‐ ( iv ) , ( c ) ‐ ( i ) , ( d ) ‐ ( ii )

( a ) ‐ ( iv ) , ( b ) ‐ ( iii ) , ( c ) ‐ ( ii ) , ( d ) ‐ ( i )

( a ) ‐ ( i ) , ( b ) ‐ ( ii ) , ( c ) ‐ ( iii ) , ( d ) ‐ ( iv )

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is the lightest element.

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Important Questions on Atoms

HARD

Physics>Modern Physics>Atoms>Early Atomic Models

Describe Rutherford atom model. What are the draw backs of this model?

HARD

Physics>Modern Physics>Atoms>Early Atomic Models

α

-particle after passing through potential difference of

V

volt collides with a nucleus. If the atomic number of the nucleus is

Z

, then distance of closest approach is

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

An alpha particle accelerated through

V

volts is fired towards a nucleus. It distance of closest approach is

r .

If a proton accelerated through the same potential is fired towards the same nucleus, its distance of closest approach will be

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

Electrons behave like gas in J.J. Thompson experiment because they

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Physics>Modern Physics>Atoms>Early Atomic Models

The number of completely filled shells for the element

_{16} S^{32}

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Physics>Modern Physics>Atoms>Early Atomic Models

The value of magnetic quantum number of the last electron of

" Na "

" is

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Physics>Modern Physics>Atoms>Early Atomic Models

A beam of fast moving alpha particles were directed towards a thin film of Gold. The parts $A^{'}, B^{'}$ and $C^{'}$ of the transmitted and reflected beams corresponding to the incident parts $A, B$ and $C$ of the beam are shown in the adjoing diagram. The number of alpha particles in

Question Image

MEDIUM

Physics>Modern Physics>Atoms>Early Atomic Models

The graph of

\ln (\frac{R}{R_{0}})

versus

\ln A

(

R =

radius of a nucleus and

A =

mass number) is

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

Match List $‐ I$ (Experiment performed) with List $‐ II$ (Phenomena discovered/associated)and select the correct option from the options given below the lists

	List-I		List-II
$(a)$	Davisson and Germer experiment	$(i)$	Wave nature of electrons
$(b)$	Millikan's oil drop experiment	$(ii)$	Charge of an electron
$(c)$	Rutherford experiment	$(iii)$	Quantisation of energy levels
$(d)$	Franck-Hertz experiment	$(iv)$	Existence of the nucleus

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

The graph which depicts the results of Rutherford gold foil experiment with

α

-particles is:

θ :

Scattering angle

Y :

Number of scattered

α

-particles detected
(Plots are schematic and not to scale)

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

In Rutherford nuclear model of an atom, for a dynamically stable orbit in hydrogen atom, the orbit radius varies with the velocity of the electron as

\frac{1}{v^{a}},

where

α

is,
(Ignore radiation due to motion of electric charge)

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Physics>Modern Physics>Atoms>Early Atomic Models

The atom is:

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Physics>Modern Physics>Atoms>Early Atomic Models

Rutherford's experiments on scattering of

α

-particles proved that:

MEDIUM

Physics>Modern Physics>Atoms>Early Atomic Models

In the Rutherford scattering, the number of scattered alpha particles per unit area striking a fluorescent screen at a given distance from a thin foil at an angle

θ

varies with kinetic energy

E

of the alpha particle as

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

The mass number and the volume of a nucleus is

M

and

V

respectively. If the mass number is increased to

2 M

then the volume is changed to

MEDIUM

Physics>Modern Physics>Atoms>Early Atomic Models

In Thomson's experiment for the determination of $(\frac{e}{m})$ of electron, electric field of intensity $' E'$ only is applied. Now the deflection produced by the electron beam is directly proportional to:

MEDIUM

Physics>Modern Physics>Atoms>Early Atomic Models

Which of the following statements is not correct according to Rutherford model?

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

In Rutherford experiment, for head-on collision of