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4

Davisson and Germer gave an experimental evidence for

A. wave nature of electron

B. particle nature of electron

C. particle nature of light

D. wave nature of light

Correct Answer :

D. wave nature of light


Related Questions

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4

The wavelength of an electron

A. is equal to that of light

B. remains constant with velocity

C. decreases with an increasing velocity

D. increases with an decreasing velocity

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4

Cathode rays contain a stream of

A. n

B. r

C. e0+1

D. e0-1

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4

Davisson and Germer gave an experimental evidence for

A. wave nature of electron

B. particle nature of electron

C. particle nature of light

D. wave nature of light

What is the correct answer?

4

The number of neutrons present in K1939 are

A. 28

B. 39

C. 20

D. 19

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4

Charge on fundamental particle neutrino is

A. 0

B. +1

C. -1

D. None of these

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4

The number of unpaired electrons in fluorine atoms is/are

A. 4

B. 2

C. 1

D. 0

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4

The atomic structure of an atom of an element is Is 1s2, 2s22p6, 3s23p6. The element is

A. Cl-35

B. S-32

C. N-18

D. O-16

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4

Among the following ions, which are has the highest paramagnetism?

A. [Cr(H2O)6]+3

B. [Fe(H2O)6]+2

C. [Cu(H2O)6]+2

D. [Zn(H2O)6]+2

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4

The interrelationship between matter and energy was given by

A. Rutherford

B. Joule

C. de Broglie

D. Einstein

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4

Which of the following atoms has a non-spherical outermost orbital.

A. H

B. Li

C. Be

D. B

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4

Which of the following weighs the least?

A. 1 g of CO2

B. 2 litres of CO2 at N.T.P.

C. 3.01×1011 molecules of CO2

D. 3.01×1022 atoms of carbon

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4

The corect set of quantum numbers for the impaired electron of fluorine atom is

A.

nlm
210

B.

nlm
211

C.

nlm
311

D.

nlm
300

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4

A dipositive ion Z++ has 2e- in the K shell, 8 e~ s in the L shell and 8e- in the M shell. Atomic number of Z is

A. 19

B. 20

C. 16

D. 15

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4

Isotones have same

A. mass number

B. nuclear mass

C. no. of neutrons

D. no. of electrons

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4

The orbitals with maximum number of possible orientation is:

A. s

B. d

C. f

D. p

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4

Mass of positron is the same to that of

A. proton

B. meson

C. electron

D. neutron

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4

The velocity of a photon is

A. dependent on its wavelength

B. dependent on its source

C. equal to cube of its amplitude

D. independent of its wavelength

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4

β rays are a stream of

A. He

B. electrons

C. positron

D. neutrons

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4

For a given energy level the number of orbitals is equal to

A. n2

B. 2l+1

C. 4(2l+3)

D. 2n3

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4

The ion that is isoelectronic with CO is

A. CN-

B. O2+

C. O2-

D. N2+

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4

Electronic configuration of Cu+ is

A. [Ar]3d9

B. [Ar]3d10

C. [Ar]3d93s2

D. [Ar]3d74s14p1

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4

Argon is isoelectronic with

A. Mg++

B. Cl-

C. Br-

D. H+

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4

The correct set of quantum numbers for the impaired electron of fluorine atom is

A.














nlm
210

B.














nlm
211

C.














nlm
311

D.














nlm
300

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4

When the electron is excited from K level to M level we get

A. γ- rays

B. cathode rays

C. continuous spectra

D. absorption spectra

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4

The angular momentum of the moving electron is equal to

A. nh

B. h22π

C. nhπ

D. nh2π

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4

No two electrons in an atom can have the same values of all four quantum numbers according to

A. Hund's rules

B. Flemming rule

C. Pauli's exclusion principle

D. Bohr theory

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4

The size of nucleus is

A. 10-12 m

B. 10-8 m

C. 10-15 m

D. 10-10 m

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4

The number of unpaired electrons in a chromic ion Cr+3 (atomic number 24) is

A. 6

B. 4

C. 3

D. 1

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4

The possible values of l for an s orbital are

A. -1, +1

B. 0 to 2

C. -2 and + 1

D. 0

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4

Frequency of the wave having wave number 20000 cm-1 is

A. 6×1012 sec-1

B. 6×1014 sec-1

C. 3×1014MHz

D. 4×106Hz