Question # 1

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

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

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

Charge on positron is:

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Negative

Positive

Netural

None of these

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The unit of Rh is.

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ms-1

m

m²

m^-1

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

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