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

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

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

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

Charge on an atom is:

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Positive

Negative

Neutral

None 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

X- ray diffraction reveals that these are

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Particle type

Wave type

Both wave and particle

None of above

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

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1972

1965

1958

1913

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

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

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

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

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