If the nuclear radius of A27l is 3.6 Fermi, the approximate nuclear radius of C64u in Fermi is

1. 2.4                                       

2. 1.2

3. 4.8                                       

4. 3.6

Subtopic:  Mass-Energy Equivalent |
 86%
From NCERT
NEET - 2012
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The half-life of a radioactive isotope X is 50 yr.

It decays to another element Y which is stable.

The two elements X and Y were found to be in 

the ratio of 1:15 in a sample of a given rock.

The age of rock was estimated to be

1. 200 yr

2. 250 yr

3. 100 yr

4. 150 yr

Subtopic:  Radioactivity (OLD NCERT) |
 73%
From NCERT
NEET - 2011
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Fusion reaction takes place at a higher temperature because:

1. atoms get ionized at high temperatures.
2. kinetic energy is high enough to overcome the Coulomb repulsion between nuclei.
3. molecules break up at a high temperature.
4. nuclei break up at a high temperature.
Subtopic:  Nuclear Energy |
 81%
From NCERT
NEET - 2011
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The decay constant of a radio isotope is λ. If A1 and A2 are its activities at times t1 and t2 respectively, the number of nuclei which have decayed during the time (t1-t2)

1. A1t1-A2t2                                       

2. A1-A2

3. (A1-A2)λ                                       

4. λ(A1-A2) 

Subtopic:  Types of Decay |
 73%
From NCERT
NEET - 2010
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The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is 

1. 23.6 MeV                                         

2. 2.2 MeV

3. 28.0 MeV                                         

4. 30.2 MeV

Subtopic:  Nuclear Binding Energy |
 89%
From NCERT
NEET - 2010
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Two radioactive material X1 and X2 have decay constants 5λ and λ respectively. If initially they have the same number of nuclei of X1to that of X2 will be 1eafter a time 

1. λ                                     

2. 12λ

3. 14λ                                 

4. eλ

Subtopic:  Radioactivity (OLD NCERT) |
 80%
From NCERT
NEET - 2008
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One nanogram of matter converted into energy will give- 

1. 90 J                     

2. 9×103 J 

3. 9×1010 J            

4. 9×104 J

Subtopic:  Nuclear Binding Energy |
From NCERT
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Fast neutrons can easily be slowed down by 

1. The use of lead shielding

2. Passing them through heavy water

3. Elastic collisions with heavy nuclei

4. Applying a strong electric field

Subtopic:  Nuclear Energy |
 73%
From NCERT
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The number of neutrons released when U23592 undergoes fission by absorbing n01 and Ba56144+Kr3689are formed, is 

1. 0           

2. 1

3. 2           

4. 3

Subtopic:  Mass-Energy Equivalent |
 63%
From NCERT
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The binding energy of nucleus is a measure of its

1. Charge             

2. Mass

3. Momentum       

4. Stability

Subtopic:  Nuclear Binding Energy |
 74%
From NCERT
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