Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 8

MEDIUM

NEET

IMPORTANT

Earn 100

There are $10^{10}$ radioactive nuclei in a given radioactive element. Its half-life time is $1 \min$ . How many nuclei will remain after $30 s$ ? $(\sqrt{2} = 1.414)$

50% studentsanswered this correctly

Important Questions on Atoms and Nuclei

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 9

Which of the following is not a mode of radioactive decay?

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 10

The half-life of

215 At

is

100 μs

. The time taken for the radioactivity of a sample of (screening)

(2 \times 3, - 1 = 6 / 90)

,

215 At

to decay to

1 / 16^{th}

of its initial value is

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 11

Two radioactive sources

A

and

B

initially contain equal number of radioactive atoms. Source

A

has a half-life of

1

hour and source

B

has a half-life of

2

hours. At the end of

2

hours, the ratio of the rate of disintegration of

A

to that of

B

is :

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 12

If

10 %

of radioactive material decays in

5 days

, then the amount of original material left after

15 days

is about

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 13

The density of nucleus is of the order of

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 14

In the nuclear reaction

{}_{6}{C^{11}} \to_{9} B^{11} + β^{+} + X^{-}

, what does

X

stand for?

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 15

As the mass number increases, binding energy per nucleon,

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 16

A nucleus represented by the symbol

{}_{Z}^{A}X

has