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The attractive potential energy between electron and nucleus is given by $U = U_{0} ℓ n (\frac{r}{r_{0}}), U_{0}$ and $r_{0}$ are constants and $' r'$ is the radius. The radius $' r'$ of the nth Bohr's orbit depends upon principal quantum number $' n'$ as:

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Important Questions on Atomic Physics

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 9

50 %

of the X-ray coming from a Coolidge tube is able to pass through a

0.1 mm

thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-ray passing through the same foil will be

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 10

Figure shows the intensity-wavelength relations of $X$ -rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube $A$ in which the potential difference between the target and the filament is $V_{A}$ and the atomic number of the target material is $Z_{A} .$ These quantities are $V_{B}$ and $Z_{B}$ for the other tube. Then,

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 11

Wavelengths of

K_{a}

lines of two elements are

250

and

179 pm

, respectively. Number of elements between these elements in the sequence will be

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 12

For soft

X

-rays the attenuation constant for aluminium is

1.73

{cm}^{- 1} .

Then the percentage of

X

-rays that will pass through an aluminium sheet of thickness

1.156 cm

will be

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 13

x

-ray tube, when operated at

50 kV

tube voltage, records an anode current

20 mA .

If the efficiency of the tube for production of

x

-rays is

1 %

then the heat produced per second in calories is nearly

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 15

In a discharge tube when

200 volt

potential difference is applied

6.25 \times 10^{18}

electrons move from cathode to anode and

3.125 \times 10^{18}

singly charged positive ions move from anode to cathode in one second. Then the power of tube is:

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 16

The wavelength of

K_{α}

X-ray line of an element of atomic number

Z = 11

λ

. The wavelength of

K_{α}

X-ray line of another element of atomic number

Z'

4 λ

. Then

Z'

is if

b = 1

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 17

Assertion: Neutrons penetrate matter more readily as compared to protons.

Reason: Neutrons are slightly more massive than protons.

The attractive potential energy between electron and nucleus is given by U=U0ℓnrr0, U0 and r0 are constants and 'r' is the radius. The radius 'r' of the nth Bohr's orbit depends upon principal quantum number 'n' as:

Important Questions on Atomic Physics

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The attractive potential energy between electron and nucleus is given by $U = U_{0} ℓ n (\frac{r}{r_{0}}), U_{0}$ and $r_{0}$ are constants and $' r'$ is the radius. The radius $' r'$ of the nth Bohr's orbit depends upon principal quantum number $' n'$ as: