Question # 1

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

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Neil Bohr

Einstein

Compton

Rutherford

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

Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.

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0.106 nm

0.212 nm

0.053 nm

0.53 x 10^-10 nm

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

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 unit of Rh is.

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ms-1

m

m²

m^-1

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

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

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

Life time of metastable states is

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10^-6 sec or more

10^-3 sec or more

10^-5 sec or more

None of these

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

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