EASY

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Rutherford's experiment on scattering of particles showed that an atom has

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Important Questions on Atomic Structure

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Two protons are kept at a separation of

10 nm .

. Let

F_{n}

and

F_{e}

be the nuclear force and the electromagnetic force between them

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

A particle of rest mass

m_{0}

is travelling, so that its total energy is twice its rest mass energy. It collides with another stationary particle of rest mass

m_{0}

to form a new particle. What is the rest mass of the new particle?

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The ratio of mass densities of nuclei of

^{40} C a

and

^{16} O

is close to:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Two protons are kept at separation of

10 nm

. Let

F_{n}

and

F_{e}

be the nuclear force and the electromagnetic force between them

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The correct increasing order of the electronegativity is

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The energy equivalent of

0.5 g

of a substance is:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Imagine that a reactor converts all the given mass into energy and that it operates at a power level of

10^{9} Watt

. The mass of the fuel consumed

per hour

, in the reactor, will be:
(velocity of light,

c

3 \times 10^{8} m s^{- 1}

)

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Density of nuclear matter is nearly

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The sum of the total number of neutrons present in protium, deuterium and tritium is

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Draw the diagram representing the schematic arrangement of Geiger Marsden experimental set up of alpha particle scattering experiment.

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Match the following entries related to fundamental forces and their manifestations

(a)	Nuclear force	(i)	Electromagnetic interaction
(b)	Force between sodium and chlorine ions in sodium chloride	(ii)	Gravitational interaction
(c)	Energy from the sun	(iii)	Strong interaction
(d)	Oscillations of a simple pendulum	(iv)	Weak interaction

The correct answer is

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

In a process, certain amount of mass gets converted into energy. Let all the energy so converted be in the form of photons. If

700 \times 10^{12} Hz

is the mean frequency of the photons and if there are approximately

10^{30}

photons, what is the approximate mass that is converted into photons? (Assume

h = 6.6 \times 10^{- 34} J s, c = 3 \times 10^{8} m s^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The radius

R

of a nucleus of mass number

A

can be estimated by the formula

R = (1.3 \times 10^{- 15}) A^{1 / 3} m

. It follows that the mass density of a nucleus is of the order of:

(M_{p r o t} ≅ M_{neut} ≃ 1.67 \times 10^{- 27} kg)

HARD

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The nuclear radius is given by

R = r_{0} A^{1 / 3},

where

r_{0}

is constant and A is the atomic mass number. Then, the nuclear mass density of

U^{238}

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The energy equivalent to a substance of mass $1 g$ is

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Identify the correct statement(s) from among the following
(i) The constancy of the binding energy per nucleon in the range

30 < A < 170

is a consequence of the fact that the nuclear force is short ranged.
(ii) The nuclear force does not depend on the charge of nucleons.
(iii) The nuclear force is repulsive when distance between two nucleons is less than

0.8 fm

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

If radius of the

{}_{13}^{27}A l

nucleus is taken to be

R_{A l}

then the radius of

{}_{53}^{125}{T e}

nucleus is nearly

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The relation between the stopping potential

(V_{0})

and frequency

(v)

is correctly represented in [

ϕ =

Work function]

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Which of the following conclusions could not be derived from Rutherford's

α

-particle scattering experiment:

Rutherford's experiment on scattering of particles showed that an atom has

Important Questions on Atomic Structure

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