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CBSE Notes 2011-2012 » XII-Physics

Atoms and Nuclei

Define decay constant of a radioactive element. [Foreign 2002]

Short answer question

Define decay constant of a radioactive element.
[Foreign 2002]

Why is the ionising power of alpha particles greater than that of gamma rays ? [Foreign 2002]

Short answer question

Why is the ionising power of alpha particles
greater than that of gamma rays ?
[Foreign 2002]

What is 'beta decay' ? [Foreign 2002]

Short answer question

What is 'beta decay' ? [Foreign 2002]

Write the S.I. unit for the activity of a radioactive nuclide. [AI 2006C]

Short answer question

Write the S.I. unit for the activity of a
radioactive nuclide. [AI 2006C]

Heavy water is often used as a moderator in thermal nuclear reactors.' Give reason. [Delhi 2004]

Short answer question

Heavy water is often used as a moderator in
thermal nuclear reactors.' Give reason.
[Delhi 2004]

Among alpha, beta and gamma radiations, which get deflected by the magnetic field ? [Foreign 2004]

Short answer question

Among alpha, beta and gamma radiations,
which get deflected by the magnetic field ?
[Foreign 2004]

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