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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

Correct Answer :

C. decreases with an increasing velocity


Related Questions

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4

Bohr's concept of the orbit in an atom was contradicted by

A. de Broglie relationship

B. Uncertainty principle

C. Planck's hypothesis

D. Hund's rule

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4

β rays are a stream of

A. He

B. electrons

C. positron

D. neutrons

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4

Which elements is represented by the following electronic configuration?

A. Nitrogen

B. Oxygen

C. Fluorine

D. Neon

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4

In the nucleus of C20a40 there are

A. 40 protons and 20 electrons

B. 20 protons and 40 electrons

C. 20 protons and 40 neutrons

D. 20 protons and 20 neutrons

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4

Charge on an electron was shown by

A. J. J. Thomson

B. Kirchoff

C. Ohm

D. M.Planck

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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

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 fundamental particle that has least mass is

A. meson

B. alpha-particle

C. electron

D. neutron

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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 interrelationship between matter and energy was given by

A. Rutherford

B. Joule

C. de Broglie

D. Einstein

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4

The maximum number of electrons in a sub-energy level is equal to

A. 4(2l+1)

B. 2(2l+1)

C. 2n2

D. n3

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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

The charge on an atom of A1327l is

A. +40

B. +27

C. +14

D. Zero

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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

The wavelength of an electron moving with a velocity 5×105m sec-1 is (h=6.63 ×10-34 kg m2 sec-1) 

A. 11.6 × 10-5m

B. 11.6 × 10-9m-1

C. 14.6 × 10-5m

D. 1.46 × 10-9m

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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

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

The atomic number of an element having the valence shell electronic configuration 4s24p6 is

A. 35

B. 26

C. 23

D. 34

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4

The relationship between energy of a radiation and its frequency was given by

A. Planck

B. Rutherford

C. Einstein

D. Joule

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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 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

In the case of atomic spectrum of hydrogen which series of lines lie in the visible region?

A. Balmer

B. Paschen 

C. Pfund

D. None of these

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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

Mass of positron is the same to that of

A. proton

B. meson

C. electron

D. neutron

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4

The number of unpaired electrons in the ground state of chromium is

A. 1

B. 6

C. 7

D. 2

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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

Which of the following has the highest mass?

A. Neutron

B. Alpha particle

C. Electron

D. Deuterium

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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

The number of unpaired electrons in fluorine atoms is/are

A. 4

B. 2

C. 1

D. 0