mp denotes the mass of a proton and  mn that of a neutron. A given nucleus of binding energy BE, contains Z protons and N neutrons. The mass m (N, Z) of the nucleus is given by [2004]

(1) m(N, Z) = Nmn+Zmp- BEc2

(2) m(N, Z) = Nmn + Zmp + BEc2

(3) m(N, Z) = Nmn + Zmp - BE / c2

(4) m(N, Z) = Nmn + Zmp + BE / c2

Concept Questions :-

Nuclear binding energy
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When a deuterium is bombarded on O168 nucleus, an α-particle is emitted, then the product nucleus is [2002]

(1) N137          (2) B105              (3) B4e9                 (4) N147

Concept Questions :-

Types of decay
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A nuclear reaction given by  XAzYAz+1+e0-1+ν¯ represents  [2003]

(1) fusion         (2) fission           (3) β-decay         (4) γ-decay

Concept Questions :-

Types of decay
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The mass of N157 is 15.00011 amu, mass of O168 is 15.99492 amu and mp= 1.00783 amu. Determine binding energy of the last proton of O168

(1) 2.13 MeV          (2) 0.13 MeV           (3) 10 MeV               (4) 12.13 MeV

Concept Questions :-

Nuclear binding energy
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The rate of disintegration of a fixed quantity of a radioactive substance can be increased by

(1) increasing the temperature

(2) increasing the pressure

(3) chemical reaction

(4) it is not possible 

Concept Questions :-

Radioactivity
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The energy released by the fission of one  uranium atom is 200 MeV. The number of fission per second required to produce 3.2 W of power is (Take, 1 eV = 1.6×10-19 J) [WB JEE 2010]

(1) 107           (2) 1010         (3) 1015          (4) 1011

Concept Questions :-

Nuclear binding energy
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The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is

(1) 1 microgram           

(2) 10 microgram       

(3) 20 microgram     

 (4) 40 microgram

Concept Questions :-

Mass-energy equivalent
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Light energy emitted by stars is due to

(1) Breaking of nuclei                          (2) Joining of nuclei       

(3) Burning of nuclei                            (4) Reflection of solar light

Concept Questions :-

Mass-energy equivalent
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The constituents of atomic nuclei are believed to be [1991]

(1) neutrons and protons

(2) protons only

(3) electrons and protons

(4) electrons, protons and neutrons

Concept Questions :-

Mass-energy equivalent
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The half-life of radium is about 1600 yr. of 100 g of radium existing now, 25 g will remain unchanged after [2004]

(1) 4800 yr         (2) 6400 yr           (3) 2400 yr           (4) 3200 yr

Concept Questions :-

Radioactivity
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