Question # 1

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

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 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

For Paschen series, the value of 'n' starts from

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2

4

6

8

Earth orbital speed is

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10 km/s

20 km/s

30 km/s

40 km/s

The unit of Rh is.

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ms-1

m

m²

m^-1

Charge on positron is:

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Negative

Positive

Netural

None of these

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

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

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10%

15%

85%

90%

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

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 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

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

Paschen series lies in the

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Far ultraviolet region

Visible region

Ultraviolet region

Inferred region

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