Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 48

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An electron of mass $m_{e}$ is moving in $n^{th}$ orbit of hydrogen atom. Magnetic field at centre due to motion of electron, is( $r_{0} =$ Bohr radius)

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Important Questions on Atoms

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 49

Electrons of mass

m

with de-Broglie wavelength

λ

fall on the target in an

X

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

X

-rays is:

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 50

Which one of the following statements is wrong in the context of

X -

rays generated from a

X -

ray tube?

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 51

The first excitation potential (in

eV

) for

H

-atom is

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 52

A proton moving with a speed

u

directly towards an

α

-particle (He nucleus) which, when the two particles were very far apart from one another, was initially at rest. The separation of the particles at their point of closest approach, is

\frac{5 e^{2}}{n π ε_{0} m_{p} u^{2}} .

Value of

n,

is (Assume

m_{α} = 4 m_{p}

).

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 53

A hydrogen atom, initially at rest, emits a photon of energy

E .

The atom (mass

M

) recoils with a speed of

\frac{2 E}{n M c} .

Value of

n,

is

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 54

Shortest wavelength of Bracket series of hydrogen like atom (atomic number

= Z

) and shortest wavelength of Balmer series of hydrogen atom are same. Then the value of

Z

is equal to

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 55

Consider a hypothetical system in which a particle of mass

m,

charge

(- 2 q)

is moving around a massive and stationary particle of charge

q,

in a circular orbit. Assume Bohr's model to be valid for the system. The orbital speed in closed orbit has largest value equal to

\frac{q^{2}}{n ε_{0} h} .

Value of

n,

is

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Gamma Question Bank for Engineering Physics>Chapter 28 - Atoms>Assignment Set-2>Q 56

de Broglie wavelength of an electron revolving in second orbit of hydrogen atom is

n π a_{0} .

Value of

n,

is (

a_{0}

is Bohr radius)