Class name Subject Book title Chapter number Content Created at
Class XII Physics Physics Part-II 2 You may recall that we had discussed the superposition principle in Chapter 14 of your Class XI textbook. Indeed the entire field of interference i...
Class XII Physics Physics Part-II 2 by y = y + y = 2 a cos t 1 2 Since the intensity is proportional to the square of the amplitude, the resultant intensity will be given by I = 4 I w...
Class XII Physics Physics Part-II 2 R [Fig. 10.9(b)] for which S R – S R = –2.5 2 1 The waves emanating from S will arrive exactly two and a half cycles later than the waves from S 2 ...
Class XII Physics Physics Part-II 2 produced by S woul2 be i a e u y2= a cos ( t + ) a i and the resultant displacement will be given by w / o e y = y1+ y2 t u = a [cos t + cos ( t + ...
Class XII Physics Physics Part-II 2 say that the two sources are incoherent and when this happens the intensities just add up. This is indeed what happens when two separate light sour...
Class XII Physics Physics Part-II 2 in phase; i.e., they will be coherent like the two vibrating needle in our water wave example [Fig. 10.8(a)]. The spherical waves emanating from S ...
Class XII Physics Physics Part-II 2 the shadow cast by an opaque object, close to the region of geometrical shadow, there are alternate dark and bright regions just like in interferen...
Class XII Physics Physics Part-II 2 The geometry of path a screen. The midpoint of the slit is M. differences for diffraction by a single slit. A straight line through M perpendicular...
Class XII Physics Physics Part-II 3 currents are now found to be at higher values. This shows that more electrons are being emitted per second, proportional to the intensity of incide...
Class XII Physics Physics Part-II 2 them, it seems that the word diffraction is more often used. In the double-slit experiment, we must note that the pattern on the screen is actually...
Class XII Physics Physics Part-II 2 any shiny convex surface (e.g., a cycle bell). Do not try direct sunlight – it can damage the eye and will not give fringes anyway as the Sun subte...
Class XII Physics Physics Part-II 2 the direction of propagation of the wave, we have what is known as a transverse wave. Also, since the displacement is in the y direction, it is oft...
Class XII Physics Physics Part-II 2 polaroid then the light wave will get linearly polarised with the electric vector oscillating along a direction perpendicular to the aligned molecu...
Class XII Physics Physics Part-II 2 vary with angle. (b) Behaviour of the electric vector when light passes through two polaroids. The transmitted polarisation is the component parall...
Class XII Physics Physics Part-II 2 the secondary waves are spherical. The rays are then perpendicular to both the wavefronts and the time of travel is the same measured along any ray...
Class XII Physics Physics Part-II 2 which can be both constructive and destructive, as shown in Young’s experiment. 3. Diffraction phenomena define the limits of ray optics. The limit...
Class XII Physics Physics Part-II 2 intensity of light at a point where path difference is /3? 10.6 A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain...
Class XII Physics Physics Part-II 3 Physics Chapter Eleven DUAL NATURE OF RADIATION AND MATTER 11.1 I NTRODUCTION The Maxwell’s equations of electromagnetism and Hertz experiments on ...
Class XII Physics Physics Part-II 3 irradiated by ultraviolet light, emitted negatively charged particles having smallspeeds.Also,certainmetalswhenheatedtoahightemperaturewere foundto...
Class XII Physics Physics Part-II 3 –19J. This unit of energy is commonly used in atomic and nuclear physics. The work function ( ) 0epends on the properties of the metal and the natu...
Class XII Physics Physics Part-II 3 fall on the emitter plate of an evacuated glass tube enclosing two electrodes (metal plates), current flows in the circuit (Fig. 11.1). As soon as ...
Class XII Physics Physics Part-II 3 the material of the emitter plate. It was found that certain metals like zinc, cadmium, magnesium, etc., responded only to ultraviolet light, havin...
Class XII Physics Physics Part-II 3 of collector plate A with respect to the emitter plate C. The intensity and frequency of the incident light can be varied, as can the potential dif...
Class XII Physics Physics Part-II 3 It is found that the photoelectric current increases with increase in positive (accelerating) potential. At some stage, for a certain positive pote...
Class XII Physics Physics Part-II 3 certain minimum cut-off with frequency of incident radiation for a frequency forwhichthestoppingpotential given photosensitive material. 0 279 is z...