Question # 1

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

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

The unit of Rh is.

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ms-1

m

m²

m^-1

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is

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1972

1965

1958

1913

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

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 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

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Visible region

Invisible region

Ultraviolet region

Infrared region

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

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

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

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

In Helium Neon laser, the discharge tube is filled with

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80% He, 20% Neon

85% He, 15% Neon

83% He, 17% Neon

90% He, 10% Neon

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

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