If a radioactive material reduces to 12.5% of its value in 24 days, then its half-life is:

1.  16 days

2.  8 days

3.  4days

4.  2 days

 

Concept Questions :-

Radioactivity
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The half-life of a radioactive material depends on

1.  The initial amount of material

2.  Rate of disintegration

3.  Decay constant

4.  Temperature and pressure

 

Concept Questions :-

Radioactivity
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Binding energy per nucleon is:

1.  Maximum for middle-order elements

2.  Maximum for lighter order elements

3.  Maximum for heavier order elements

4.  None of these

 

Concept Questions :-

Nuclear binding energy
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In the equation AI1327 + He24  P1530 + X where X is-

1.  P11 

2.  H12 

3.  He24 

4.  n01

Concept Questions :-

Mass-energy equivalent
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The half-life of a radioactivity isotope X is 100years. It decays to an element Y which is stable. The two elements are found to be ratio 1: 31 in a sample of a given rock. Assuming that at the time of formation of the rock there was only isotope X, then estimate the age of the rock.

1.  300 years

2.  400 years

3.  500 years

4.  600 years

Concept Questions :-

Radioactivity
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A chain reaction is continuous due to

1.  Large mass defect

2.  Large energy

3.  Production of more neutrons in fission

4.  None of these

Concept Questions :-

Mass-energy equivalent
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After five half-lives what will be the fraction of the initial substance

1.  1210  

2.  125  

3.  124  

4.  123

Concept Questions :-

Radioactivity
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Density (D) of nucleus related to mass no. (A) as

1.  D  A  

2.  D  A2  

3.  D  A0 

4.  D  A-1

 

Concept Questions :-

Mass-energy equivalent
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Heavier nuclei are unstable. The correct statement is :

1.  binding energy per nucleon is small

2.  get stability by nuclear fission

3.  get stability by nuclear fusion

4.  both (1) and (2)

 

Concept Questions :-

Nuclear binding energy
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binding energy per nucleon for deuteron H21 and helium He42 are 1.1 MeV and 7.0 MeV respectively. Energy released when two deuteron fuse to form a He nucleus is 

1.  47.12 MeV

2.  34.4 MeV

3.  11.8 MeV

4.  23.6 MeV

Concept Questions :-

Nuclear binding energy
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