The relationship between disintegration constant λ and half-life [T] will be:

(1) λ=log10 2T                    (2) λ=loge 2T

(3) λ=Tloge 2                      (4) λ=log2 eT

Subtopic:  Radioactivity (OLD NCERT) |
 78%
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If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by Fpp, Fnn and Fpn respectively, then [1991]

(1) FppFnnFpn

(2) FppFnn and Fpp=Fnn

(3) Fpp=Fnn=Fpn

(4) FppFnnFpn

Subtopic:  Nuclear Binding Energy |
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In a given reaction,

XAZYAZ+1KA-4Z-1KA-4Z-1

Radioactive radiations are emitted in the sequence of  

(1)  α, β, γ       (2) γ, α, β             (3) β, α, γ            (4) γ, β, α

Subtopic:  Radioactivity (OLD NCERT) | Types of Decay |
 91%
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If a proton and anti-proton come close to each other and annihilate, how much energy will be released?

1. \(1.5 \times10^{-10}~\text{J}\) 2. \(3 \times10^{-10}~\text{J}\)
3. \(4.5 \times10^{-10}~\text{J}\) 4. None of these
Subtopic:  Mass-Energy Equivalent |
 54%
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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is 

(1) to control energy released in the reactor

(2) to absorb neutrons and stop the chain reaction

(3) to cool the reactor

(4) to slow down the neutrons to thermal energies

Subtopic:  Nuclear Energy |
 69%
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The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form a helium atom, the energy released is 

(1) 19.2 MeV            (2) 23.6 MeV             (3) 26.9 MeV                (4) 13.9 MeV

Subtopic:  Nuclear Binding Energy |
 76%
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PMT - 2001
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In a fission reaction,

U92236X117+Y117+n+n

the binding energy per nucleon of X and Y is 8.5 MeV whereas of U236 is 7.6 MeV. The total energy liberated will be about [1997]

(1) 2000 MeV          (2) 200 MeV               (3) 2 MeV            (4) 1 keV

Subtopic:  Nuclear Binding Energy |
 77%
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A nuclear decay is expressed as 

C116B115+β++X

Then the unknown particle X is:

(1) Neutron          (2) antineutrino             (3) proton               (4) neutrino

Subtopic:  Types of Decay |
 61%
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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 

Subtopic:  Radioactivity (OLD NCERT) |
 54%
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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

Subtopic:  Nuclear Binding Energy |
 67%
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