Question # 1

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

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

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Double

Half

One third

One fourth

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

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

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

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

The range of wavelengths of colurs in the visible colours is

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140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

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