Question # 1

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

In Helium Neon laser, the discharge tube is filled with

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80% He, 20% Neon

85% He, 15% Neon

83% He, 17% Neon

90% He, 10% Neon

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

Charge on an atom is:

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Positive

Negative

Neutral

None of these

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

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1972

1965

1958

1913

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

Paschen series lies in the

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Far ultraviolet region

Visible region

Ultraviolet region

Inferred region

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 following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

Laser is a device which can produce:

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Intense beam of light

Coherant beam of light

Monochromatic beam of light

All of the above

The Balmer series is obtained when all the transition of electrons terminate on

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1^st orbit

2nd orbit

3rd orbit

4th orbit

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

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