Question # 1

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

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10%

15%

85%

90%

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

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

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

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

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 unit of Rh is.

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ms-1

m

m²

m^-1

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

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

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

Earth orbital speed is

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10 km/s

20 km/s

30 km/s

40 km/s

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

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