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CBSE Notes 2011-2012 » XII-Physics

Electromagnetic Waves

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]

What is the name given to that part of electromagnetic spectrum which is used for taking photographs...

Short answer question

What is the name given to that part of
electromagnetic spectrum which is used for
taking photographs of earth under foggy
conditions from great heights ? [Delhi 2004]

What is the name given to that part of electromagnetic spectrum which is used in 'Radar' ? [Delhi 20...

Short answer question

What is the name given to that part of electromagnetic
spectrum which is used in 'Radar' ?
[Delhi 2004]

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