Question # 1

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

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

Laser is a device which can produce:

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Intense beam of light

Coherant beam of light

Monochromatic beam of light

All of the above

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

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10%

15%

85%

90%

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

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

Boher proposed his atomic model in:

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1910

1911

1912

1913

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

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

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