Question # 1

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

X- ray diffraction reveals that these are

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Particle type

Wave type

Both wave and particle

None of above

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

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

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

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

A° is the unit of:

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Energy

Length

Nuclear energy

Work

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

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10.2 eV

0 eV

3.4 eV

6.8 eV

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

Helium Neon Laser Beam emitted from discharge tube has a colour.

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Blue

Green

Red

Black

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

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

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

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