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Find the wavelength of electromagnetic waves of frequency `4xx10^9Hz` in free space. Gives its two applications.

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Find the wavelength of electromagnetic waves of frequency `4xx10^9Hz` in free space. Gives its two applications.
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`lambda=c/v =(3xx10^8)/(4xx10^9) =0.075m`
This wavelength
belongs to microwave region. The microwaves
are used (i) In microwave ovens (ii) in radar system for the navigation of aircraft.
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