Question # 1

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

None of these

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

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