A sample of carbon from an ancient frame gives 7 counts of C 14 per minute per gram of carbon. If freshly cut wood gives 15 . 3 counts of C 14 per minute per gram, what is the age of the frame? (Half-life period of C 14 = 5770 years)

N = 7 count / minute N 0 = 15 . 3 count / minute N = N 0 1 2 t t 1 / 2 7 15 . 3 = 1 2 t 5770 Taking log on both sides and solving, log 7 15 . 3 = log 1 2 t 5770 log 7 - log 15 . 3 = t 5770 log 1 2 0 . 8451 - 1 . 1847 = t 5770 [ log 1 - log 2 ] - 0 . 3396 = t 5770 [ 0 - 0 . 3010 ] t = 6510 years

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The nucleus which undergoes disintegration is called the daughter nucleus and that which is produced after the disintegration is called a parent nucleus.

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Important Questions on Nuclear Physics

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

^{227} A c

has a half-life of 22 years with respect to radioactive decay. The decay follows two parallel paths:

^{227} Ac \to^{227} T h

and

^{227} Ac \to^{223} F r

. If the percentage of the two daughter nuclides are

2.0

and

98.0

, respectively the decay constant (in

y e a r^{- 1}

) for

^{227} Ac \to^{227} T h

path is closest to

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Science>Physics>Nuclear Physics>Radio Activity

Select the correct option

EASY

Science>Physics>Nuclear Physics>Radio Activity

In theory, it would take an infinite time for all the unstable nuclei in a sample of a radionuclide to decay. However, the activity of radionuclide decreases sharply within

5 - 10

periods of their half-lives. Calculate the percentage of a radionuclide that will remain after

10

-half-life periods.

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

The number of neutrons accompanying the formation of

_{54}^{139} Xe

and

_{38}^{94} Sr

from the adsorption of a slow neutron by

_{92}^{235} U

followed by nuclear reaction is.

EASY

Science>Physics>Nuclear Physics>Radio Activity

Name two radioactive elements which are not found in observable quantity in nature. Why is it so?

EASY

Science>Physics>Nuclear Physics>Radio Activity

Find out the names of the particles in the nucleus and the orbits in atoms.

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

A sample of carbon from an ancient frame gives

7

counts of

{}^{14}C

per minute per gram of carbon. If freshly cut wood gives

15.3

counts of

{}^{14}C

per minute per gram, what is the age of the frame? (Half-life period of

{}^{14}C = 5770

years)

EASY

Science>Physics>Nuclear Physics>Radio Activity

Actinium-

225

(

t_{1 / 2} = 10

days) is an alpha emitter used in targeted alpha therapy (TAT). Deduce the nuclear equation for the decay of actinium-

225

EASY

Science>Physics>Nuclear Physics>Radio Activity

When does nucleus of an atom tend to be radioactive?

EASY

Science>Physics>Nuclear Physics>Radio Activity

In the chain reaction.

${}_{92}^{238}U ⟶ Ba + Kr + 3 {}_{0}^{1}n +$ energy $E$

neutrons and energy produced at $n$ th step will be

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

Using the periodic table, list out the radioactive elements. Also identify the name of the groups in which they are present.

EASY

Science>Physics>Nuclear Physics>Radio Activity

One becquerel of radioactivity is equal to

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

Define the term atoms.

EASY

Science>Physics>Nuclear Physics>Radio Activity

In theory, it would take an infinite time for all the unstable nuclei in a sample of a radionuclide to decay. However, the activity of radionuclide decreases sharply within

5 - 10

periods of their half-lives. Calculate the percentage of a radionuclide that will remain after

5

-half-life periods.

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

A.G.M. counter is used to study the radioactive process of first-order. In the absence of radioactive substance A, it counts 3 disintegration per second

(d p s)

. When A is placed in the

G . M

. counter, it records

23 d p s

at the start and

13 d p s

after

10 m i n u t e s

. It records

x d p s

after next

10 m i n u t e s

and A has half-life period y minutes.

x

and

y

are :

HARD

Science>Physics>Nuclear Physics>Radio Activity

Arrange the following in the chronological order of discovery.
A nuclear reactor, Radioactivity, Artificial radioactivity, Discovery of radium.

EASY

Science>Physics>Nuclear Physics>Radio Activity

Can a single radioactive element simultaneously emit all the three types of radiation?

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

At radioactive equilibrium, the ratio between number of atoms of radioactive elements A and B is

3.1 \times 10^{9} : 1

. If the half-life period of A is

2 \times 10^{10} y r s,

then the half-life of B is

MEDIUM

Science>Physics>Nuclear Physics>Radio Activity

When is said to be the nucleus unstable?

EASY

Science>Physics>Nuclear Physics>Radio Activity

One becquerel of radioactivity is equal to

The nucleus which undergoes disintegration is called the daughter nucleus and that which is produced after the disintegration is called a parent nucleus.

Important Questions on Nuclear Physics

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