MEDIUM

Earn 100

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

Important Questions on Atomic Physics

EASY

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)

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

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 :

EASY

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?

EASY

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

W. K. Roentgen discovered

MEDIUM

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

What are cathode rays?

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

The wavelength of the characteristic X-ray $K_{α}$ line emitted by a hydrogen like element is 0.32 Å. The wavelength of the $K_{β}$ line emitted by the same element will be___________.

EASY

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 of the emitted X-rays 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

Electrons with de Broglie wavelength

λ

fall on the target

X

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

X

-ray is

HARD

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

To produce characteristic X-rays using a Tungsten target in an X-ray generator, the accelerating voltage $V_{accelerating}$ should be greater than ______ volts and the energy $E$ of the characteristic radiation is ______ $eV .$

(The binding energy of the innermost electron in Tungsten is $40 keV$ ).

MEDIUM

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

Let

λ_{α}, λ_{β}

and

λ_{α}^{'}

denote the wavelengths of the

X

-rays of the

K_{α}, K_{β}

and

L_{α}

lines in the characteristic

X

-rays for a metal

EASY

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

The shortest wavelength of X-rays emitted from an X-rays tube depends upon

EASY

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

The de-Broglie wavelength of electron falling on the target in an X-ray tube is

λ

. The cut-off wavelength of the emitted X-ray is

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)

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?

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

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

Important Questions on Atomic Physics

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