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

For an atom of hydrogen atom the radius of the first orbit is given by:

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H/me²

me/4h²

h2/4π² kme²

h² me²

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

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

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

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2

4

6

8

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

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

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Energy

Mass

Wave length

Momentum

For Holography we use

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X ray

Laser

gama rays

Beta rays

The X-rays diffraction with crystal was first studied by

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W.H Bragg

W.L. Bragg

Michelson

None of these

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 unit of Rh is.

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ms-1

m

m²

m^-1

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