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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In Wilson cloud chamber experiment, two particles were found to show equal deviation but in opposite directions. The names positron and negatron were given to these particles by Andersson. Negatron should be

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Important Questions on Atoms

MEDIUM

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

A beam of electrons of energy E scatters from a target having atomic spacing of

1 Å

. The first maximum intensity occurs at

θ = 60 ° .

Then

E (in eV)

is........
(Planck's constant

h = 6.64 \times 10^{- 34} J s, 1 eV = 1.6 \times 10^{- 19} J,

electron mass

m = 9.1 \times 10^{- 31} kg

)

HARD

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

Consider the following statement:

(I) All isotopes of elements have the same number of neutrons.

(II) Only one isotope of an element can be stable and non-radioactive.

(III) All elements have isotopes.

(IV) All isotopes of Carbon can form chemical compounds with Oxygen $- 16$ .

The correct option regarding an isotope is:

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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

MEDIUM

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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

HARD

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

A proton of mass

m

and charge

e

is projected from a very large distance towards an

α

-particle with velocity

v .

Initially

α

-particle is at rest, but it is free to move. If gravity is neglected, then the minimum separation along the straight line of their motion will be

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

The number of completely filled shells for the element

_{16} S^{32}

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Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

Rutherford's experiments on scattering of

α

-particles proved that:

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Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

Particle used in the Rutherford's scattering experiment to deduce the structure of atoms

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Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

The value of magnetic quantum number of the last electron of

" Na "

" is

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

In Rutherford experiment, for head-on collision of

α -

particles with a gold nucleus, the impact parameter is

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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

HARD

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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)

MEDIUM

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

In 1911, the physical Ernest Rutherford discovered that atoms have a tiny, dense nucleus by shooting positively charged particles at a very thin gold foil. A key physical property which led Rutherford to use gold was that it was

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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

EASY

Physics>Modern Physics>Atoms>Alpha-particle Scattering and Rutherford's Nuclear Model of Atom

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)

In Wilson cloud chamber experiment, two particles were found to show equal deviation but in opposite directions. The names positron and negatron were given to these particles by Andersson. Negatron should be

Important Questions on Atoms

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