N atoms of a radioactive element emit n alpha particles per second. The half life of the element is

(a) nN sec                    (b) Nn sec
(c) 0.693 Nn sec           (d)  0.693 nN sec

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Radioactivity
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The radioactive nucleus N713 decays to C613 through the emission of 
(a) Neutron              (b) Proton
(c) Electron              (d) Positron

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Radioactivity
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The radioactive decay of uranium into thorium is expressed by the equation U92238Th90234+X where 'X' is

(a) An electron                (b) A proton
(c) A deuteron                 (d) An alpha particle

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Radioactivity
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In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process 
(a) Proton              (b) Neutron
(c) Electron            (d) Photon

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Radioactivity
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The half life (T) and the disintegration constant λ of a radioactive substance are related as
(a) λT=1                     (b) λT=0.693
(c) Tλ=0.693              (d) λT=0.693

Concept Questions :-

Radioactivity
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The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be

(a) 93.75%                  (b) 75%
(c) 25%                       (d) 6.25%

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Radioactivity
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In the uranium radioactive series, the initial nucleus is U92238 and the final nucleus is Pb82206. When the uranium nucleus decays to lead, the number of  α-particles emitted will be 
(a) 1                (b) 2
(c) 4                (d) 8

Concept Questions :-

Types of decay
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Which of the following is a correct statement

(a) Beta rays are same as cathode rays
(b) Gamma rays are high energy neutrons
(c) Alpha particles are singly ionized helium atoms
(d) Protons and neutrons have exactly the same mass

Concept Questions :-

Types of decay
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Ne22 nucleus after absorbing energy decays into two α-particles and an unknown nucleus. The unknown nucleus is 
(a) Nitrogen              (b) Carbon
(c) Boron                  (d) Oxygen

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Types of decay
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The half life of I131 is 8 days. Given a sample of I131 at time t = 0, we can assert that 
(a) No nucleus will decay before t = 4 days
(b) No nucleus will decay before t = 8 days
(c) All nuclei will decay before t = 16 days
(d) A given nucleus may decay at any time after t = 0

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Radioactivity
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