In the experiment for the determination of e m of electrons by the Thomson method, electric and magnetic fields are

Both mutually perpendicular and also perpendicular to the motion of electron

Parallel and both are perpendicular to the motion of the electron

Both mutually perpendicular and parallel to the motion of electron

Both mutually perpendicular and have no relation with motion of the electron

In the experiment for the determination of e m of electrons by the Thomson method, electric and magnetic fields are

Both mutually perpendicular and also perpendicular to the motion of electron

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 the experiment for the determination of $\frac{e}{m}$ of electrons by the Thomson method, electric and magnetic fields are

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Important Questions on Atoms

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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

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Physics>Modern Physics>Atoms>Early Atomic Models

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

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Physics>Modern Physics>Atoms>Early Atomic Models

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

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Physics>Modern Physics>Atoms>Early Atomic Models

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

)

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Physics>Modern Physics>Atoms>Early Atomic Models

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:

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Physics>Modern Physics>Atoms>Early Atomic Models

In Rutherford experiment, for head-on collision of

α -

particles with a gold nucleus, the impact parameter is

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Physics>Modern Physics>Atoms>Early Atomic Models

Any

f

-orbit can accommodate upto

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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

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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 atom is:

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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

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Physics>Modern Physics>Atoms>Early Atomic Models

The pair of atoms among the following having the same structure 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

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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)

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Physics>Modern Physics>Atoms>Early Atomic Models

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

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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

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

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Physics>Modern Physics>Atoms>Early Atomic Models

Atomic number is represented by:

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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

The number of completely filled shells for the element

_{16} S^{32}

In the experiment for the determination of em of electrons by the Thomson method, electric and magnetic fields are

Important Questions on Atoms

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In the experiment for the determination of $\frac{e}{m}$ of electrons by the Thomson method, electric and magnetic fields are