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4

In Rutherford experiment the number of a-particles scattered through an angle 60° is 112 per minute, then the number of α particles scattered through an angle of 90° per minute by the same nucleus is :

A. 28 per min

B. 112 per min

C. 12.5 per min

D. 7 per min

Correct Answer :

A. 28 per min


Related Questions

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4

The angular momentum of electron in hydrogen atom is proportional to :

A. r

B. 1r

C. r2

D. 1r

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4

Number of electrons that constitute one ampere of current is :

A. 265x1016

B. 625x1012

C. 4.8 x 1010

D. 625x1016

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4

In Rutherford experiment the number of a-particles scattered through an angle 60° is 112 per minute, then the number of α particles scattered through an angle of 90° per minute by the same nucleus is :

A. 28 per min

B. 112 per min

C. 12.5 per min

D. 7 per min

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4

Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines which it can emit while returning to the ground state, is :

A. 12n(n-1)

B. 12n(n+1)

C. n(n -1)

D. n(n +1)

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4

A proton and an alpha particle having same momentum enter a magnetic field at right angles to it. If r1 and r2 be their radii respectively then value of r1r2 is :

A. 1

B. 2

C. 1/2

D. 1/4

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4

In terms of Rydberg Constant R, the wave number of the first Balmer line is :

A. R

B. 3R

C. 5R36

D. 8R9

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4

Minimum excitation potential of Bohr's first orbit in hydrogen atom is:

A. 13.6 V

B. 3.4 V

C. 10,2 V

D. 3.6 V

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4

It is given for the azimuthal quantum number l = 3, the total number of different possible values of the magnetic azimuthal quantum number, ml is :

A. 3

B. 7

C. 4

D. 5

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4

In the lowest energy level of hydrogen atom, electron has the angular momentum:

A. πh

B. hπ

C. h2π

D. 2πh

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4

The mass and energy equivalent to 1 a.m.u. respectively are :

A. 1.67 x 10-27 g, 9.30 MeV

B. 1.67 x 10-27 kg, 930 MeV

C. 1.67 x 10-27 kg, 1 MeV

D. 1.67 x 10-34 kg, 1 MeV

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4

The acceleration of electron in the first orbit of hydrogen atom is:

A. 4π2mh3

B. h24π2mr

C. h24π2m2r3

D. m2h24π2r3

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4

α-particles are projected towards the nuclei of the following metals, with the same kinetic energy. Towards, which metal, the distance of closest approach is minimum ?

A. Cu (Z = 29)

B. Ag (Z = 47)

C. Au (Z = 79)

D. Pd (Z = 46)

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4

For electron moving in nth orbit of the atom, the angular
velocity is proportional to :

A. n

B. 1n

C. n3

D. 1n3

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4

If the electron in a hydrogen atom jumps from an orbit level n1 = 3 to an orbit level n2 = 2, the emitted radiation has a wavelength given by :

A. λ=365R

B. λ=5R36

C. λ=6R

D. λ=R6

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4

The mass of an electron in motion depends upon:

A. direction of motion

B. its velocity

C. its velocity of e-

D. it's shell number

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4

The order of size of nucleus and Bohr radius of an atom respectively are:

A. 10-14m, 10-10m

B. 10-10m, 10-8m

C. 10-20m, 10-16m

D. 10-8m, 10-6m

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4

An α-particle accelerated through V volt is fired towards a nucleus. Its distance of closest approach is r. If a proton accelerated through the same potential is fired towards the same nucleus, the distance of closest approach of proton will be :

A. r

B. 2r

C. r/2

D. r/4

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4

Which of the following is incorrect regarding Rutherford's atomic model ?

A. Atom contains nucleus

B. Size of nucleus is very small in comparison to that of atom

C. Nucleus contains about 90% mass of the atom

D. Electrons revolve round the nucleus with uniform speed

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4

If Bohr's radius is R0 then radius of 3rd orbit of hydrigen atom will be:

A. 3R0

B. 6R0

C. 9R0

D. 12R0

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4

The distance of closest approach of an α-particle fired towards a nucleus with momentum p, is r. What will be the distance of closest approach when the momentum of a-particle is 2p ?

A. 2r

B. 4r

C. r/2

D. r/4

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4

The radius of hydrogen atom, when it is in its second excited state, becomes :

A. half

B. double

C. four times

D. nine times

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4

In the lowest orbit, the binding energy of an electron in hydrogen atom is 13.6 eV. The energy required to take out the electron from the lower three orbits in (eV) will be:

A. 13.6, 6.8, 8.4

B. 13.6, 10.2, 3.4

C. 13.6, 27.2, 40.8

D. 13.6, 3.4, 1.5

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4

The KE of the electron in an orbit of radius r in hydrogen atom is : (e = electronic charge)

A. e2r2

B. e22r

C. e2r

D. e22r2

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4

The velocity of an electron in its fifth orbit, if the velocity of an electron in the second orbit of sodium atom (atomic number = 11) is v, will be :

A. v

B. 225v

C. 52v

D. 25v