Question # 1

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

For Paschen series, the value of 'n' starts from

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2

4

6

8

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is

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1972

1965

1958

1913

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

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