Question # 1

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

The temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

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

Charge on an atom is:

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Positive

Negative

Neutral

None of these

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

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

Earth orbital speed is

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10 km/s

20 km/s

30 km/s

40 km/s

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 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

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

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

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

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