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Byju's Answer

Standard XII

Physics

Stopping Potential vs Frequency

In an X-ray...

Question

In an $X -$ ray tube the acceleration voltage is $20 k V$ . Two targets $A$ and $B$ are used one by. For $A$ the wavelength of the $K_{a}$ line is $62 p m$ . For $B$ the wavelength of the $L_{a}$ line is $124 p m$ . The energy of the $B$ ion with vacancy in $^{'} M^{'}$ shell is $5.5 k e V$ higher than the atom of $B$ .[Take $h c = 12400 e V ˚ A$ ]

Value of

λ_{m i n}

0.62 ˚ A

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A

will emitte

K_{a} - p h o t o n

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A

will emitte

L - p h o t o n s

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minimum wavelength (in

˚ A

) of the characteristic

X -

ray that wil be emitted

^{'} B^{'}

0.8 A

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Solution

The correct options are
A Value of $λ_{m i n}$ is $0.62 ˚ A$ .
C $A$ will emitte $L - p h o t o n s$
D minimum wavelength (in $˚ A$ ) of the characteristic $X -$ ray that wil be emitted $^{'} B^{'}$ is $0.8 A$

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Similar questions

Q. In an

X -

ray tube, the accelerating voltage is

20 kV

. Two targets

A

and

B

are used one by one. For

A

the wavelength of the

K_{α}

line is

62 pm

, For

B

the wavelength of the

L_{α}

line is

124 pm

. The energy of the

B

ion with vacancy in

M

shell is

5.5 keV

higher than atom of

B

[Take h c = 12400 eV ˚ A]

Q. Mark the correct options.
(a) An atom with a vacancy has smaller energy that a neutral atom.
(b) K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
(c) The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
(d) The wavelength of K_α X-ray is smaller than the wavelength of K_β X-ray of the same material.

Q. Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K shell electrons of tungsten have ionization energy 72.5 keV. X-rays emitted by the tube contain only

Q. Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?
(a) Frequency
(b) Energy
(c) Penetrating power
(d) Method of creation

Q. The wavelength of

K_{α} X-ray

of tungsten is

21.3 pm

. It takes

11.3 keV

to knock out an electron from the

L-shell

of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having a tungsten target which allows production of

K_{α} X-ray

(h c = 1242 eV-nm)

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In an X−ray tube the acceleration voltage is 20 kV. Two targets A and B are used one by. For A the wavelength of the Ka line is 62 pm. For B the wavelength of the La line is 124 pm. The energy of the B ion with vacancy in ′M′ shell is 5.5 keV higher than the atom ofB.[Take hc=12400 eV˚A]

The correct options are A Value of λmin is 0.62 ˚A. C A will emitte L−photons D minimum wavelength (in ˚A) of the characteristic X−ray that wil be emitted ′B′ is 0.8 A

The correct options are
A Value of $λ_{m i n}$ is $0.62 ˚ A$ .
C $A$ will emitte $L - p h o t o n s$
D minimum wavelength (in $˚ A$ ) of the characteristic $X -$ ray that wil be emitted $^{'} B^{'}$ is $0.8 A$