Question # 1

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

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

Helium Neon Laser Beam emitted from discharge tube has a colour.

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Blue

Green

Red

Black

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

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

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 electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

The X-rays diffraction with crystal was first studied by

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W.H Bragg

W.L. Bragg

Michelson

None of these

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

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