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CBSE Notes 2011-2012 » XII-Physics

Electromagnetic Waves

Name the scientist who first (i) predicted the existence of electromagnetic waves (ii) experimentall...

Short answer question

Name the scientist who first (i) predicted the
existence of electromagnetic waves
(ii) experimentally demonstrated the existence
of electromagnetic waves. [Delhi 2004C]

Why is shortwave band used for long distance radio broadcast ? [AI 2004]

Short answer question

Why is shortwave band used for long distance
radio broadcast ? [AI 2004]

Arrange the given electromagnetic radiations in the descending order of their frequencies : Infra-re...

Short answer question

Arrange the given electromagnetic radiations
in the descending order of their frequencies :
Infra-red, X-rays, Ultraviolet and Gamma rays.
[Delhi 2002]

Why are short wave bands used for long distance transmission of signals ? [AI 2002]

Short answer question

Why are short wave bands used for long
distance transmission of signals ? [AI 2002]

Why are T.V signals not transmitted using sky waves ? [AI 2002]

Short answer question

Why are T.V signals not transmitted using sky
waves ? [AI 2002]

Name the electromagnetic radiation to which the following wavelengths belong : (a) 10-2 m (b) 1 A [D...

Short answer question

Name the electromagnetic radiation to which
the following wavelengths belong :
(a) 10-2 m (b) 1 A [Delhi 2006C]

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