28/03/2020 Superposition of Waves(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Superposition of Waves(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. When two waves meet up, their displacements destruct each other subtract down cancel out ad up 2. A double-slit interference experiment is set up as shown.Fringes are formed on the screen which is 40.0 cm away. The distance between the slits is 9.0 cmapart. The microwave source has a wavelength of 2.0 cm and intensity of I.What is the resultant intensity at X? 4l zero l 2l 3. For a wave propagating in a medium, identify the property that is independent of the others. All these depend on each other Velocity Wavelengths Frequency 4. Coherent sources emit waves that have constant phase difference increasing phase difference decreasing phase difference varying phase differences 5. Wavelength of an incident light when it is incident normally on a diffraction grating having 3000 lines per centimeter angular separation is 10° is 500 nm 650 nm 580 nm 600 nm 6. From double slit experiment, the quantities to be measured are slit-to-screen distance fringe separation all of the above slit separation 7. If equation of a sound wave isy=0.0015sin(62.8x+314t)Then its wavelength will be ____ 2unit 0.2units 0.1unit 0.3unit 8. Which is different from others by units? Mechanical equivalent Phase difference Poisson’s ratio Loudness of sound 9. The plane wave is described by the equationy=3cos(x/4-10t-π/2),Where c is in meters and t in seconds. The maximum velocity of the particles of the medium due to this is? 3/4 m/s 3π/2 m/s 30m/s 40m/s 10. A wave is diffracted as it passes through an opening in a barrier.The amount of diffraction that the wave undergoes depends on both the wavelength and speed of the incident wave. amplitude of the incident wave and the size of the opening wavelength of the incident wave and the size of the opening. amplitude and frequency of the incident wave. 11. A transverse wave passes through a string with the equationy=10sinπ(0.02x-2t)Where x is in metres and t in seconds. What is the maximum velocity of the particles in wave motion? 121m/s 63m/s 78m/s 100m/s 12. 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? 400 m/s 370 m/s 330 m/s 270 m/s 13. If two sound waves having a phase difference of 60°, then they will have a path difference of _____ ʎ/3 3ʎ ʎ ʎ/6 14. A suspension bridge is to be built across a valley where it is known that the wind can gust at 5 second interval. It is estimated that speed of transverse waves along the span of the bridge would be 400 m/s. The danger of resonant motion in the bridge at its fundamental frequency would be the greatest if the span had a length of 1000 m 80 m 400 m 2000 m 15. Fringes are referred to as normal points minima nodes maxima 16. Grating element is equal to nλ/sinθ sinθ cosθ nλ 17. 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? 2 nd order 3 rd order 4 th order 5 th order 18. Which of the following is always true for a stationary wave? No energy is transferred from one end of the wave to the other. All particles have the same amplitude. The particles in the wave oscillate perpendicularly to the direction of wave travel All particles vibrate in simple harmonic motion with the same frequency as the wave 19. Extra distance travelled by one of waves compared with other is called displacement path difference path phase difference 20. Two waves with phase difference 180° have resultant of amplitude doubles the single wave one same as the single wave zero 21. 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? N/n Nn n/N 1/Nm 22. Travelling waves of wavelength 20 cm are created in the air columns in a closed pipe P and an open pipe Q. The lengths of the pipes are shown.In which pipe or pipes are stationary waves formed Q only neither P nor Q P only P and Q 23. Two transverse waves overlap. Crests overlap with troughs. Troughs overlap with crests. The waves are In-phase Out-of-synchronicity In-synchronicity Out-of-phase 24. In young double slit experiment, the wavelength of incident beams should be different zero same opposite 25. 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, have the same amplitude and differ in phase by 180° the same amplitude and differ in phase by 90° different amplitudes and are in phase the same amplitude and are in phase 1 out of 25 Time is Up! Time's up