12 Superposition Notes

- ¡Æ n o t in H 1 syllabus light. (T he structure and use of the spectrometer are not required . ) (mr describe the use of a diffraction grating to determ ine the w avelength of principa©¥ m axim a produced by a diffraction grating . (I) ' re ca ll a n d u se the eq u atio n d sin e = n to lo c a te th e p o s itio n s o f th e single aperture. (k) ' re c a ll a nd use the R ayleigh criterion e . À / b fo r th e re so ©¥ving p ow e r o f a m inim a for single slit diffraction. ü) " re c a ©¥©¥ a n d u s e th e e q u a tio n s in ©¬ ¡¤ j b to lo c a te th e p o s itio n o f th e firs t interference using light. (i) recal©¥ and solve problem s using the equation À = ax /D fo r d o u b ©¥e - s ©¥it interference fń nges to be observed. (h) show an understanding of the conditions required for tw o - s o u r c e new in H 2 syllabus interference using w ater, ©¥ight and m icrow aves. (g) show an understanding of experim ents w hich dem onstrate twsource and a narrow gap . including the diffraction of w ater w aves in a ripple tank w ith both a w ide gap show an understanding of experim ents w hich dem onstrate diffraction (e) exp©¥ain the m eaning of the term diffraction. identify nodes and antinodes. (d) exp©¥ain the form ation of a stationary w ave using a graphical m ethod, a n d waves using m icrow aves, s tre tched strings and alr co©¥um ns. (c) show an understanding of experim ents w hich dem onstrate stationary di¨¤erence and path difference. (b) show an understanding of the term s Interference, c o herence, phase (a) exp©¥ain and use the princip©¥e of superposition ©¥n sim ple app©¥ications, e Learnïng O utcom es S i ng l e- s ©¥it and multip©¥s©¥it di¨¤raction T w o - s o u r c e Interference D i ffrac t ion s t at ion a r y wa v es P r inc lp©¥e of sup e r po s ition S yllabus C ontent 12 S U P E R P O S IT IO N . . H ìplca 9 74 9 C hapter Y E A R 5 - 6 P H Y S IC S D E P A R T M E N T J R A F FL E S IN S T IT U T IO N : \ . ' (

0 displacem ent is the vector sum of the displacem ents due to each w ave. F ©¥g . 1 . W hen tw o w aves arrive at a point at the sam e tim e, the resultant 11 the principle of superposition. sources) m eet at a point in space? T he answer to this question is provided by W hat happens when tw o w aves of the sam e kind (e. g . s o u n d waves from two m agnetic field. electrom agnetic w aves, the disturbance refers to the varying electric and displacem ent of the particles of the m edia from their equilibrium position. F or S uperposition m echanica©¥ w aves, like sound and w ater w aves, the disturbance refers to the P rinciple of A w ave is a disturbance that travels through a m edium or vacuum . F or Y E A R 5 - 6 P H Y S IC S D E P A R T M E N T R A F F L E S ©¥N S T ©¥T U T ©¥O N

treatm ent can be found in A ppendix A . F ig . 3 . S uperposition of two w aves displaced by % Ä apart. A m athem atica©¥ 4 \©¥©© . 1 » \ ©¥l ©¥1n oa A t