28/03/2020 Superposition of Waves(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Superposition of Waves(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. A wire is stretched over two supports, Q and R, a distance 4x apart. Three light pieces of paper rest on the wireWhen the wire is made to vibrate at one particular frequency, the middle piece of paper stays on, but the others fall off the wire.The wavelength of the vibration produced on the wire?3x8x2x4x2. If two waves are in phase and have the same amplitude then resultant wave hashalf of amplitude of single wavesame amplitude as single wavethrice of amplitude of single wavetwice of amplitude of single wave3. Fringes are referred to asnodesnormal pointsmaximaminima4. For destructive interference, the path difference isodd number of half wavelengthseven whole number of wavelengtheven number of half wavelengthswhole number of wavelengths5. When two waves meet up, their displacementscancel outad upsubtract downdestruct each other6. Grating element is equal tonλ/sinθnλsinθcosθ7. Interference pattern of light and dark bands on screen is calledgraphical patternline spectrumlight spectrumfringes8. Coherent sources emit waves that haveincreasing phase differencevarying phase differencesdecreasing phase differenceconstant phase difference9. From double slit experiment, the quantities to be measured areslit-to-screen distanceslit separationall of the abovefringe separation10. A diffraction grating with N lines per metre is used to deflect light of various wavelengths λ. The diagram shows a relation between the deflection angles of θ for different values of λ in the nth order interference pattern.What is the gradient of the graph?NnN/nn/N1/Nm11. A speaker producing sound of frequency 2500 Hz is placed at the open end of a closed pipe containing a gas.As the piston is moved along the pipe, a series of 6 loud sounds was heard. The first loud sound was observed when the piston was 4.0 cm away from the open end, and the sixth loud sound was observed when the piston was 37 cm away from the open end. What is the speed of sound in the gas?270 m/s400 m/s370 m/s330 m/s12. The waves produced by a motor boat sailing in water are __________Longitudinal and transverseTransverseLongitudinalStationary13. Two transverse waves overlap. Crests overlap with crests. Troughs overlap with troughs. The waves areOut-of-synchronicityOut-of-phaseIn-phaseIn-synchronicity14. A string is stretched under constant tension between fixed points X and Y. The solid lie in the diagram shows a standing (stationary) wave at an instant of greatest displacement. The broken line shows the other extreme displacement.Which one of the following statements is correct?The distance between P and Q is one wavelengthThe string at P' and Q' will next move in opposite directions to one another otherAt the moment shown, the energy of the standing wave has both kinetic energy and potential energyA short time later, the string at R will be displaced15. In young double slit experiment, the wavelength of incident beams should beoppositezerosamedifferent16. Visible of light has a wavelength of6 e3 m3 e8 m5 e-7 m4 e4 m17. With diffraction grating, the angles aregreaterclose to zerosmallzero18. The diagram shows a string with with ends P and T fixed. The string is made to vibrate transversely so that P, R and T are the only points on the string which are nodesThe vibrations of the two points Q and S, shown on the string, havethe same amplitude and differ in phase by 90°the same amplitude and are in phasedifferent amplitudes and are in phasethe same amplitude and differ in phase by 180°19. If two sound waves having a phase difference of 60°, then they will have a path difference of _____3ʎʎʎ/6ʎ/320. If equation of a sound wave isy=0.0015sin(62.8x+314t)Then its wavelength will be ____0.1unit0.2units2unit0.3unit21. A boat at anchor is rocked by waves, whose crests are 100m apart and velocity is 25m/s. The boat bounces up once in every ____0.25s2500s4s75s22. Principle of superposition can be applied toradio wavesEM wavesall of the abovesound waves23. Constructive interference happens when two waves arein frontzero amplitudein phaseout of phase24. The mercury spectrum contains two intense yellow lines with wavelengths of 577.0 nm and 579.1 nm respectively. Light from a mercury lamp is incident normally on a diffraction grating ruled with 4300 lines per centimetre. To distinguish the two yellow lines clearly, it is desirable that there should be an angular separation of at least 0.30° between the two lines. Which order of diffraction can be used?4 th order2 nd order3 rd order5 th order25. For listening radio in cars, external radio aerials are used becauseradio waves have shorter wavelengthradio waves have longer wavelengthradio waves require a medium to propagateradio waves cannot pass through window26 out of 25Time is Up! Time's up
