These arrive after P waves. Ex.23 For the given ray diagram, draw the wavefront, ==========================================================, Reflection and Refraction - Waves, Class 11, Science. And in terms of optical path length, phase difference would be given by. Since light travels more slowly in glass. (b) The incoherent sources have phase difference that varies randomly with time. If intensity at the two slits are I1 = 4I0 , I2 = I0, find, (ii) distance of 5th minima from the central maxima on the screen, Ex.9 A beam of light consisting of wavelength 6000 Å and 4500 Å is used in YDSE with D = 1 m and. 4. Learners at any stage of their preparations will be benefited by the course. Wave. (ii) As shown in figure, the position of a source is S and of observer is O. Reach to us. Such a disturbance is Called a shock wave. (iii) Ultrasonic Waves The sound waves of frequency greater than 20000 Hz are called ultrasonic waves. After a time t, a secondary wavefront of radius v2t with A as centre would have travelled into medium 2. Jun 13, 2020 - NCERT Textbook - Waves Class 11 Notes | EduRev is made by best teachers of Class 11. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide? This is Snell's law of, refraction that we have already dealt with from Eq. To get fastest exam alerts and government job alerts in India, join our Telegram channel. Jan 04, 2021 - Waves, Chapter Notes, Class 11, Physics (IIT-JEE and AIPMT) Class 11 Notes | EduRev is made by best teachers of Class 11. White light is used to find out the central maxima position of YDSE set up because at this position only, all the wavelength show constructive interference i.e. At antinodes, the displacement of the particles remains maximum, strain is minimum, pressure and density variations are minimum. Shape of the Pattern when the interference takes place due to waves produced by two point sources(where the line of sources is parellel to the screen). It happens so because S2 compensates the path difference (arised due to optical path length covered by S1) by covering more geomatrical path length. (ii) Longitudinal waves A wave in which the particles of the medium vibrate in the same direction in which wave is propagating, is called a longitudinal wave. Share on Facebook Share on Twitter. (i) When Source is Moving and Observer is at Rest When source is moving with ‘velocity towards an observer at rest, then apparent frequency. would have zero radius. NCERT Exemplar Class 11 Physics is very important resource for students preparing for XI Board Examination. When waves formed by a storm develop in a water current against the normal wave direction, an interaction can take place which results in a shortening of the wave frequency. It is the sound of lowest frequency produced in fundamental note., vibration of a system. EduRev is like a wikipedia We also show a secondary wavelet originating from a point D in between A and C. Its radius is less than v2t. All the particles between two nodes vibrate in same phase. Free courses. A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. 3)Velocity (i) Sun glasses filled with polaroid sheets protect our eyes from glass. (a) The sources are said to be coherent if they have constant phase difference between them. 3. From Eq. Now the waves were gigantic. fundamental frequency or frequency of first harmonic, frequency of first overtone or second harmonic. 2. Ex.22 Interference fringes are produced by a Fresnel's biprism in the focal plane of reading microscope which is 100 cm from the slit. lenses, and mirrors can be understood. As before, let us calculate the time taken to travel between the wavefronts along any ray. In YDSE, ray is incident on the slit at an inclination of q0 to the axis of symmetry of the experimental set-up for points above the central point on screen, (say for P1). Fringes observed in the Fresnel's biprism experiment are vertical stringht lines. When a transpoarent plate of thickness 0.5 mm is placed over one of the slits, the fringe pattern is displaced by 5 mm. 9. A wave is a vibratory disturbance in a medium which carries energy from one point to another point without any actual movement of the medium. We provide JEE/NEET, MHT-CET, 11th/12th Regular, CBSE, State Board, Online Test Series, Foundation courses. (iii) A concave mirror produces a similar effect. Monochromatic light after passing through two slits S1 & S2 acts as coherent sources of light waves that interfere constructively & destructively at different point on the screen to produce a interference pattern. These waves travel in the form of compressions and rarefactions. where, ES, is the adiabatic coefficient of volume elasticity and it is equal to γ p. Factors Affecting Velocity of Longitudinal (Sound) Wave. Find out concepts related to waves by visiting BYJU'S Maximum amplitude = (a + b) Class 11 Waves, Chapter Notes, Class 11, Physics (IIT-JEE and AIPMT) Class 11 Notes | EduRev Summary and Exercise are very important for Each ray take same time to reach from one wavefront to another wavefront. 1. However slightly below or above the position of central maxima fringes will be coloured. If the phase difference due to two source at a particular point remains constant with time, then the two sources are considered as coherent source. Ex.13 In YDSE with D = 1m, d = 1mm light of wavelength 500 nm is incident at an angle of 0.57° w.r.t the axis of symmetry of the experimental set up. NCERT Physics Class 11 Notes contains all chapters are part of Revision Notes Of Physics Class 11. A transparent sheet of thickness t = 1.5 × 10-7 m, refractive index n = 1.17, is placed over one of the slits. (ii) Pitch or Frequency Pitch of sound directly depends on frequency. 11.09.2020 English Secondary School When did the waves start getting gigantic 1 See answer ss0871049 is waiting for your help. Therefore, (p/ρ) remains constant at constant temperature. 2. Distant Parallel Rays → Planar wave front. Microscope : For microscope, q is the well resolved semi-angle of cone of light rays entering the telescope, then limit of resolution =, where n sinθ is called numerical aperture, NA. Interference implies super position of waves. This explains the tilt in the emerging wavefront. Mathematically. For maxima, Dx= l (because x should be minimum), Path difference between the direct & reflected ray, = x + (due to reflection, a phase change of p or path change of takes place). Superposition of two light travelling in almost same direction results in modification in the distribution of intensity of light in the region of superoposition. Waves, Chapter Notes, Class 11, Physics (IIT-JEE and AIPMT) Class 11 Notes | EduRev chapter (including extra questions, long questions, short questions, mcq) can be found on EduRev, you can check Figure (a) shows an incident wavefront which makes an angle 'i' with the surface separating twc media, for example, air and water. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Ex.4 Find the maximum intensity in case of interference of n identical waves each of intensity I0 if the interference is (a) coherent and (b) incoherent. (i) Wavelength The distance between two nearest points in a wave which are in the same phase of vibration is called the wavelength (λ). Figure : In Young's interference experiment, light diffracted from pinhole S0 encounters pinholes S1 and S2 in screen B. Chapter 15 Class 11 Waves Progressive Harmonic Transverse Travelling-Wave Inference-Wave Standing-Waves Modes Vibration JEE Mains/NEET PDF Notes [sound waves cannot propagate through vacuum. CBSE > Class 11 > English Core 1 answers; Gaurav Seth 3 months ago. about 0.75 times the speed of light in vacuum. A wave is a vibratory disturbance in a medium which carries energy from one point to another point without any actual movement of the medium. Get the learning app. The minimum distance from a sound reflecting surface to hear an echo is 16.5 m. If first echo be heard after It second, second echo after ~ second, then third echo will be heard after (t1 + t2)s. Two or more progressive waves can travel simultaneously in the medium without effecting the motion of one another. J a n u a r y. Consider superposition of two sinusoidal wave (having same frequency), at a particular point. Polarisation by Reflection : Brester's Law : If unpolarised light falls on a transparent surface of refractive index n at a certain angle lp, called polarising angle, then reflected light is plane polarised. Ex.14 White light, with a uniform intensity across the visible wavelength range 430-690 nm, is perpendicularly incident on a water film, of index of refraction m = 1.33 and thickness d = 320 nm, that is suspended in air. Class 11. (iii) If θ = 90°, the Vs cos θ = 0 and there is no shift in the frequency. In usual interference pattern with a monochromatic source, a large number of identical interference fringes are obtained & it is usually not possible to determine the position of central maxima Interference with white light is used to determine the position of central maxima in such case. Whenever two or more than two waves superimpose each other they give sum of their individual diplacement. For a string, the wave function is a (Vector) displacement; whereas for sound waves, it is (scalar) pressure or density fluctuation. (iii) When Source and Observer Both are Moving, (a) When both are moving in same direction along the direction of propagation of sound, then. When a screen MN is placed as shown in the figure, the interference fringes are observed only in the region BC. (i) Intensity or Loudness Intensity of sound is energy transmitted per second per unit area by sound waves. The secondary wavefront with C as centre would have just started, i.e. Hence, t =AC (sin r¢)/v2. Ex.2 S1 and S2 are two source of light which produce individually disturbance at point P given by E1 = 3 sin wt, E2 = 4 cos wt. The phenomena of apparent change in frequency of source due to a relative motion between the source and observer is called Doppler’s effect. The absolute refractive index of air about 1.0003, quite close to 1. on introduction of a glass slab in the path of the light coming out of the slits -, On introduction of the thin glass-slab of thickness t and refractive index m, the optical path of the ray S1P increases by t(m - 1). Clearly, the portion of the incoming wavefront which travels through the greatest thickness of glass has been delayed the most. Wave front is a locus of particles having same phase. According to Laplace, the propagation of longitudinal wave is an adiabatic process. where, ET is the isothermal coefficient of volume elasticity and it is equal to the pressure of the gas. Toll Free No. Here l = 4.8 × 10-7 m, d = 0.3 × 10-2 m, Distance of 5th bright from the central bright band is. (i) The Doppler’s effect in sound does not take place in the transverse direction. Learn the fundamentals of waves and sound in this unit. The weather changed for worse on January 2. My enrollments. VIEWS. There is no backward flow of energy when a wave travels in the forward direction. Ex.21 In a biprism experiment, fringe width is measured as 0.4 mm. Progressive Waves Classify waves on the basis of direction of motion of medium particles. Waves Class 11 NCERT solutions PDF provides students with many practise exercises as well as a detailed explanation of the questions and solutions provided in the chapter. 1. Now the path difference between waves coming form S1 and S2 at any point P is. Note : Sources lying on same wavefront are coherent in nature because their phase difference = 0, ==========================================, Principle of Superposition and Interference - Waves, Class 11, Science. Points O and central maxima mm and the central maximum where the bright fringes due to the same all! ( p/ρ ) remains constant at constant temperature expressions for 't ' gives us the law of refraction into plane. 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