Question # 1

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

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

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

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

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10%

15%

85%

90%

Charge on an atom is:

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Positive

Negative

Neutral

None of these

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

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

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

Charge on positron is:

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Negative

Positive

Netural

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 following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

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 typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

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

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV

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

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