Question # 1

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

A° is the unit of:

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Energy

Length

Nuclear energy

Work

Boher proposed his atomic model in:

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1910

1911

1912

1913

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

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

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

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

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

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

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 temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

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

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