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Earn 100

State the Duane-Hunt formula for continuous X-rays.

Important Questions on Atomic Physics

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Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

W. K. Roentgen discovered

EASY

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

Electrons of mass,

m

with de-Broglie wavelength,

λ

fall on the target in an X-ray tube. The cutoff wavelength,

(λ_{0})

of the emitted X-ray is

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

What are cathode rays?

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Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

Wavelength of characteristic X-ray depends on which property of target?

(where, A = Mass number, Z = Atomic number)

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

An electron beam is accelerated by a potential difference

V

to hit a metallic target to produce

X -

rays. It produces continuous as well as characteristic

X -

rays. If

λ_{m i n}

is the smallest possible wavelength of

X -

ray in the spectrum, the variation of

\log (λ_{m i n})

with

\log (V)

is correctly represented in :

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Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

The waves emitted when a metal target is bombarded with high energy electrons are

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Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

The frequency of

K_{a}

line of a source of atomic number

z

is proportional to

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

How are the characteristic x-rays spectrum formed?

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

In an

X

-ray tube, electrons emitted from a filament (cathode) carrying current

I

hit a target (anode) at a distance

d

from the cathode. The target is kept at a potential

V

higher than the cathode resulting in emission of continuous and characteristic X-rays. If the filament current

I

is decreased to

\frac{I}{2},

the potential difference

V

is increased to

2 V,

and the separation distance

d

is reduced to

\frac{d}{2},

then

EASY

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

An X-ray tube is operated at

1.24

million volt. The shortest wavelength of the produced photon will be:

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

Electrons with de Broglie wavelength

λ

fall on the target

X

-ray tube. The cut-off wavelength of the emitted

X

-ray is

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

In Coolidge tube experiment, if applied voltage is increased to three times, the short wavelength limit of continuous

X -

ray spectrum shifts by

20 pm

. What is the initial voltage applied to the tube ?

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

Which one of the following statement is wrong, in the context of

X

-rays generated from

X

-ray tube?

HARD

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

K_{α}

and

K_{β}

X-rays are emitted when there is a transition of electron between the levels

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Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

The

K_{α}

X

-ray emission line of tungsten occurs at

λ = 0.021 nm

. The energy difference between

K

and

L

levels in this atom is about

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

An X-ray machine is operated at

40 kV .

The short wavelength limit of continuous X-rays will be

(h = 6.63 \times 10^{- 34} J s, c = 3 \times 10^{8} m s^{- 1}, e = 1.6 \times 10^{- 19} C)

HARD

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

Electrons with de-Broglie wavelength

λ

fall on the target in an

X

-ray tube. The cut-off wavelength for the emitted

X

-rays is

MEDIUM

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

K_{α}

and

K_{β}

X-rays are emitted when there is a transition of electron between the levels

EASY

Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

The intensity of X-rays from a coolidge tube is plotted against wavelength λ as shown in the figure. The minimum wavelength found is λ_c and the wavelength of the K_α line is λ_k. As the accelerating voltage is increased

Question Image

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Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays

A beam of 35.0 keV electrons strikes a molybdenum target, generating the X-rays. What is the cut-off wavelength?

State the Duane-Hunt formula for continuous X-rays.

Important Questions on Atomic Physics

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