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Photon having wavelength $12.4 nm$ was allowed to strike a metal plate having work function $25 eV$ . Calculate the -

(a) Maximum kinetic energy of photoelectrons emitted in $eV$ .

(b) Wavelength of electron with maximum kinetic energy in $Å$ .

(c) Calculate the uncertainty in wavelength of emitted electron, if the uncertainty in the momentum is $6.62 \times 10^{- 28} kg m / \sec$

Important Questions on Structure of Atom

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-1>Q 6

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because-

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-1>Q 41

The sum of the number of neutrons and protons in the isotopes of hydrogen is :

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-2>Q 12

λ_{0}

is the threshold wavelength for photoelectric emission,

λ

wavelength of light falling on the surface of metal, and

m

mass of electron, then de Broglie wavelength of emitted electron is :-

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-2>Q 16

An electron in a hydrogen atom in its ground state absorbs energy equal to ionisation energy of ${Li}^{+ 2} .$ The wavelength of the emitted electron is :-

Given: Planck's constant $= 6.62 \times 10^{- 34} Js$ , mass of electron $= 9.1 \times 10^{- 31} kg$ , Ionisation energy of hydrogen ${IE}_{H} = 2.18 \times 10^{- 19} J / atom$

HARD

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-2>Q 54

The energies of energy levels

A, B

and

C

for a given atom are in the sequence

E_{A} < E_{B} < E_{C} .

If the radiantions of wavelengths

λ_{1}, λ_{2}

and

λ_{3}

are emitted due to the atomic transitions

C

B, B

A

and

C

A

respective then which of the following relations is corret

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-3>Q 47

Odd electron molecule is paramagnetic.

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-4>Q 19

A particle of charge equal to that an electron and mass

208

times the mass of the electron moves in a circular orbit around a nucleus of charge

+ 3 e

. Assuming that the Bohr model of the atom is applicable to this system, (a) derive an expression for the radius of the

n^{th}

bohr orbit, (b) find the value of

n

for which the radius of the orbit is approximately the same as that of the first Bohr orbit for the hydrogen atom, and (c) find the wavelength of the radiation emitted when the revolving particle jumps from the third orbit to the first. The values of

r_{n}, n & λ

maybe:

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Beta Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>EXERCISE-4>Q 24

CO

is isoelectronic with

Important Questions on Structure of Atom

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