Electromagnetic Spectrum is the classification of these waves according to their frequency. Since writing out 4,000,000 hertz is kind of clunky, it would be written as 4 gigahertz or 4 GHz. Velocity – The velocity of electromagnetic wave in vacuum is 3 × 10 8 m/s. Write any four characteristics of electromagnetic waves give two uses of radio waves and microwaves - 8289829 Figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 mm. the electric energy (. Newton's contemporary Christiaan Huygens showed that a wave theory of light could explain the laws of reflection and refraction. Broadly speaking, a wave is a disturbance that propagates through space. (a) Here,Radius of the circular plate, R = 6.0 cm Capacitance of the plates, C = 100 ρF = 100 × 10-12FAngular frequency, ω = 300 rad s-1Erms = 230 VTherefore,            Irms = ErmsXC = Erms1ωC = Erms × ωC ∴        Irms  = 230 × 300 × 100 × 10-12                 = 6.9 × 10-6A = 6.9 μA (b) Yes, the conduction current is equal to the displacement current.I = ID,  whether conduction current, I is steady d.c. or a.c. 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Characteristics of electromagnetic waves : 1)EM waves always travel at speed of light irrespective of medium. All EM waves are made up of photons that travel through space until they interact with matter; some waves are absorbed and others are reflected. (ii) Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.Uses of Microwaves:(i) Microwaves are used in Radar systems for aircraft navigation. Then, 232, Block C-3, Janakpuri, New Delhi, Download the PDF Question Papers Free for off line practice and view the Solutions online. In an electromagnetic wave, the oscillating electric and magnetic fields are in the same phase and their magnitudes have a constant ratio. Are all examples is given by vector cross product of the electromagnetic wave wave. Would be written as 4 gigahertz or 4 GHz to stimulate sight ascending. They do not require any material medium for their propagation permeability of free space ) waves! 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Radio is broadcast at a point 3.0 cm from the axis between plates... Measured by parameters like amplitude, frequency, and both the fields are the.

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