Question # 1

Charge on an atom is:

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Positive

Negative

Neutral

None of these

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

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 Balmer series is obtained when all the transition of electrons terminate on

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1^st orbit

2nd orbit

3rd orbit

4th orbit

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

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

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

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10%

15%

85%

90%

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

The unit of Rh is.

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ms-1

m

m²

m^-1

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

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

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1972

1965

1958

1913

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

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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