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Explain the following, giving proper reason : (a) During charging of a capacitor, displacement current exists in the capacitor. But there is no displacement current when it gets fully charged. (b) The frequency of microwaves in ovens matches with the resonant frequency of water molecules. (c) Infrared waves are also known as heat waves.
Identify the electromagnetic wave whose wavelengths range is from about (a) 10⁻¹² m to about 10⁻⁸ m. (b) 10⁻³ m to about 10⁻¹ m. Write one use of each.
Write two uses of any two of these radiation.
Write any two characteristics of an electromagnetic wave. Why are microwaves used in radar systems ?
The frequency of an electromagnetic radiation is 1.0 × 10¹¹ Hz. Identify the radiation and mention its two uses.
Electromagnetic waves of wavelengths λ₁, λ₂ and λ₃ are used in radar systems, in water purifiers and in remote switches of TV, respectively.
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