Question # 1

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

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

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 velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

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 first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

A° is the unit of:

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Energy

Length

Nuclear energy

Work

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

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

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

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

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

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