Question # 1

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

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

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

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

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

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

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

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Life time of metastable states is

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10^-6 sec or more

10^-3 sec or more

10^-5 sec or more

None of these

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

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