Newton proposed the particle theory of light to explain the bending of light upon reflection from a mirror or upon refraction when passing from air into water. electromagnetic wave propagating in the +x-direction, with the electric field E G pointing in the +y-direction and the magnetic field B G in the +z-direction, as shown in Figure 13.4.1 below. Definition: Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In an electromagnetic wave, the oscillating electric and magnetic fields are in the same phase and their magnitudes have a constant ratio. Give two uses of (i) radio-waves (ii) Microwaves. (ii) The oscillations of and are perpendicular to each other and are in same phase. Listed below are some important characteristics and properties of electromagnetic waves. © (c) Yes, Kirchhoff's first rule is valid at each plate of the capacitor provided. Then, 232, Block C-3, Janakpuri, New Delhi, (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. They are created due to the vibration of an electrical charge. Characteristics of electromagnetic waves (i) Electromagnetic waves are produced by accelerated charges. (2 marks) o write any four properties of an electromagnetic waves 1) Arrange the following EM waves in ascending order of frequency gamma rays, Infrared. 4. We are giving a brief of these as well for your better understanding. 2- E.M waves do not require any material medium for their propagation. This formula goes through even if displacement current, I. Uses of Radio waves:(i) They are used in radio and TV communication systems. You may also want to check out these topics given below! (ii) Microwave ovens are used for cooking purposes. (a)    What is the wavelength of the wave? (b)    Is the conduction current equal to the displacement current? According to Maxwell, varying the electric field gives rise to a magnetic field. Light is an example of an electromagnetic wave. We previously learned a lot about the structure and nature of waves. The refractive index of a material is given by: The light vector (also known as the electric vector) is the reason for the optical effects due to an electromagnetic wave. Let the electromagnetic wave travel along +x-axis, and, https://www.zigya.com/share/UEhFTjEyMDU3MjQ3. (a)    What is the rms value of the conduction current? (ii) E.M. waves do not require any material medium for their propagation. Broadly speaking, a wave is a disturbance that propagates through space. Your email address will not be published. Since writing out 4,000,000 hertz is kind of clunky, it would be written as 4 gigahertz or 4 GHz. 3- E.M wave …. (a) Given,Radius of capacitor plates, r = 12 cm = 0.12 mdistance between the plates, d = 5.0 mm = 5 × 10-3mCharge carried, I = 0.15 APermittivity of medium, ε0 = 8.85 × 10-12 C2 N-1 m2∴ Area of cross-section of plates, A = πR2 = 3.14 × (0.12)2 m2 Capacitance of parallel plate capacitor is given by                        C = ε0Ad         = 8.85 × 10-12× (3.14) × (0.12)25 × 10-3         = 80.1 × 10-12 = 80.1 pFNow, charge on capacitor plate, q = CV      ⇒           dqdt = C × dVdt⇒                     I = C × dVdt              ∵ I = dqdt ⇒                        dVdt = IC = 0.1580.1 × 10-12                                                 = 1.87 × 109 Vs-1 (b) Displacement current is equal to the conduction current i.e., 0.15 A. Characteristics of waves. Characteristics of electromagnetic waves: (i) Electromagnetic waves are produced by accelerating or oscillating charge. Write any four characteristics of electromagnetic waves. 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It can be expressed as follows – Velocity = $\lambda v$ Other characteristics of a wave are amplitude and period. Micro-waves. (ii) They do not require any material medium for propagation. We can see waves in water and hear waves as sound, but we haven't yet discussed the waves that we perceive as light. The terminology of different parts of the electromagnetic spectrum is given in the text. Lower frequency electromagnetic waves, such as radio waves, are generally accepted to not be harmful. The frequency of an electromagnetic wave is a factor in whether it is relatively harmless or dangerous to living organisms. Electromagnetic waves are transverse waves. The general solution to the electromagnetic wave equation is a linear superposition of waves of the form (,) = ((,)) = (− ⋅)(,) = ((,)) = (− ⋅)for virtually any well-behaved function g of dimensionless argument φ, where ω is the angular frequency (in radians per second), and k = (k x, k y, k z) is the wave vector (in radians per meter).. The changes in the electric field or the magnetic field represent the wave disturbance in the EM waves. However, higher frequency radiation, such as gamma rays and X-rays, are extremely harmful at certain exposure levels. (iv) E.M. waves are transverse in nature. Give its two applications. Write four main characteristics of electromagnetic waves. It is given as: $$\vec{E}\times \vec{B}$$. The velocity of a wave is the product of multiplication of wavelength and frequency. Visible light is only a small part of a grou… (iii) They are transverse in nature. Write any four characteristics of electromagnetic waves give two uses of radio waves and microwaves - 8289829 Electromagnetic Spectrum is the classification of these waves according to their frequency. Electromagnetic waves are transverse in nature as they propagate by varying the electric and magnetic fields such that the two fields are perpendicular to each other. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15A. Download the PDF Question Papers Free for off line practice and view the Solutions online. explain any four characteristics of electromagnetic waves - Physics - TopperLearning.com | 3966 Property 2: They propagate by varying electric fields and magnetic fields, such that these two fields are at right angles to each other and at a right angle with the direction of propagation of the wave. Write any four characteristics of electromagnetic wave give two uses of radio waves and microwaves - Brainly.in. The direction of propagation of the electromagnetic wave is given by vector cross product of the electric field and magnetic field. In his view, light was a stream of particles emitted from a light source, entering the eye to stimulate sight. Characteristics of electromagnetic waves: (i) Electromagnetic waves are produced by accelerating or oscillating charge. (iii) E.M. waves travel in free space with a velocity C = 1μ0 ε0 which is equal to the velocity of light (c = 3 × 108 m/s). Physics Assignment Help, Write any four characteristics of electromagnetic waves, Write any four characteristics of electromagnetic waves. Electromagnetic waves can show interference or diffraction. (iv) They travel through vacuum with same speed, (i) Radiowaves are used (a) in radiotransmission The magnetic and the electric fields come at 90° to each other and the combined waves move perpendicular to both electric and magnetic oscillating fields occurring the disturbance. Electromagnetic Wave Electromagnetic Wave are waves composed of undulating electrical fields and magnetic fields. Wave characteristics. The electromagnetic (EM) spectrum encompasses all wave frequencies, including radio, visible light and X-rays. 2. The electromagnetic waves (EM waves) are transverse in nature. The changing electric and magnetic fields result in the propagation of electromagnetic waves (or light waves) even in vacuum. Give two characteristics of electromagnetic waves. $$\frac{1}{μ}\overrightarrow{E} ~×~ \overrightarrow{B}$$. (b)    What is the amplitude of the oscillating magnetic field? The different kinds of electromagnetic waves, such as light and radio waves, form the electromagnetic spectrum. Electromagnetic waves have constant velocity in vacuum and it is … The energy from the sun is received by the earth through electromagnetic waves. It means that when electromagnetic waves strike to the surface of conducting material, they are reflected back as shown in the given diagram. The formula above shows that they oscillate in phase. A parallel plate capacitor (Fig.) Electromagnetic waves have constant velocity in vacuum and it is nearly equal to. Give two uses each of 1. Find wavelength of electromagnetic waves of frequency 5 x 10 19 H z in free space. Newton's contemporary Christiaan Huygens showed that a wave theory of light could explain the laws of reflection and refraction. ii) Arrange the following EM waves in ascending order of frequency. Characteristics of electromagnetic waves: (iii) E.M. waves travel in free space with a velocity. (iii) In an electromagnetic wave, the electric Vector(E) and magnetic Vector(B) field vectors are at right angles to each other and to the direction of propagation. Mechanical Waves Need a Characteristics of Mechanical and Electromagnetic waves By: Susie and Braxton Electromagnetic Waves Do not need a medium to transfer energy. 1- Electromagnetic waves are produced by accelerating or oscillating charge. Your email address will not be published. Write any five electromagnetic waves in the order of decreasing frequency and sa metala write any two properties and uses of each Property 3: Electromagnetic ultraviolet, 2 3 (2marks) microwaves (b) A standing wave produced in 1.2 m long string which has a mass per unit length of 1.84 x 10 kg/m. Characteristics of electromagnetic waves : 1)EM waves always travel at speed of light irrespective of medium. Property 1: Electromagnetic waves are transverse in nature. Velocity – The velocity of electromagnetic wave in vacuum is 3 × 10 8 m/s. Listed below are some important characteristics and properties of electromagnetic waves. Ltd. Download books and chapters from book store. Write the expression for the velocity of electromagnetic waves in terms of permittivity and magnetic permeability of free space. Characteristic of electromagnetic waves are as follows: - (i) They do not require any material medium for their propagation. Refraction of Electromagnetic Waves. Waves are described and measured by parameters like amplitude, frequency, and wavelength. Electromagnetic waves are not deflected by electric or magnetic field. 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. An accelerated charge produces a time-varying magnetic field which in turn produces a time-varying electric field. gamma rays, infrared, ultraviolet, microwaves (2marks) (b) A standing wave produced in 1.2 m long string which has a mass per unit length of 1.84 x 103 kg/m. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation. Search. Radio, micro, infrared, x-ray, and TV waves are all examples. (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. 2. (c)    Show that the average energy density of the E field equals the average energy density            of the B field, [c = 3 × 108 m s-1]. Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another. (iv) E.M. waves are transverse in nature. 2021 Zigya Technology Labs Pvt. In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 × 1010 Hz and amplitude 48 V m-1. The formula above shows that they oscillate in phase.Since ID = I, we have                      B = μ0rI2πR2 If I = I0, the maximum value of current, thenAmplitude of B = maximum value of B = μ0rI02πR2  = μ0r2Irms2πR2                         ∵ I0 = 2 Irms= 4π × 10-7 × 0.03 × 2 × 6.9 × 10-62 × 3.14 × (0.06)2T= 1.63 × 10-11T. Lot about the structure and nature of waves radius R = 6.0 cm has capacitance... Wave since at any … 4 or magnetic field from ripples on a pond to ocean! 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