Question # 1

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

A° is the unit of:

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Energy

Length

Nuclear energy

Work

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

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

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

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

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

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1972

1965

1958

1913

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

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 series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

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