Question # 1

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

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

Photons must have energy equal to

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ev

En

hf

None of these

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

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

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

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

Tick the series which lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

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

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 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

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

The natural arrangement of colours in the spectrum of white light spectrum is

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

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

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ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers

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