What is the respective number of α and β-particles emitted in the following radioactive decay?

X90200Y80168   

(1) 6 and 8               (2) 6 and 6           (3) 8 and 8          (4) 8 and 6   

Concept Questions :-

Types of decay
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The half-life of radium is 1622 years. How long will it take for seven-eighth of a given amount of radium to decay

(1) 3244 years             (2) 6488 years           (3) 4866 years        (4) 811 years

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The mass of a proton is 1.0073 u and that of the neutron is 1.0087 u (u = atomic mass unit) The binding energy of H2e4 is (mass of helium nucleus = 4.0015 u)

(1) 28.4 MeV          (2) 0.061 u             (3) 0.0305 J          (4) 0.0305 erg

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The binding energies of the nuclei A and B are Ea and Eb respectively. Three atoms of the element B fuse to give one atom of element A and an energy Q is released.Then Ea, Eb and Q are related as

(1) Ea-3Eb=Q                    (2) 3Eb-Ea=Q

(3) Ea+3Eb=Q                    (4) Eb+3Ea=Q

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A free neutron decays into a proton, an electron and 

(1) a beta particle                 (2) an alpha particle

(3) an antineutrino                (4) a neutrino

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


In a radioactive sample the fraction of initial number of radioactive nuclei, which remains undecayed after n mean lives is 

(1) 1en            (2) en            (3) 1-1en            (4) 1e-1n

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The activity of a radioactive sample is measured as 9750 counts/min at t = 0 and as 975 counts/min at t = 5 min. The decay constant is approximately:

(1) 0.922/min           

(2) 0.691/min         

 (3) 0.461/min           

(4) 0.230/min

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The energy equivalent of one atomic mass unit is [1992]

(1) 1.6×10-19 J                   (2) 6.02×1023 J

(3) 931 MeV                             (4) 9.31 MeV

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Solar energy is due to

1. fusion reaction

2. fission reaction

3. combustion reaction

4. chemical reaction

Concept Questions :-

Mass-energy equivalent
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


At time t = 0, N1 nuclei of decay constant λ1 and N2 nuclei of decay constant λ2 are mixed. The decay rate of mixture is

1.  -N1N2e-λ1+λ2t 

2.  -N1N2 e-λ1+λ2t 

3.  -N1λ1e-λ1t + N2λ2e-λ2t 

4.  -N1λ1N2λ2e-λ1+λ2t

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: