StandingWaves_P2 [41 marks]
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1 StandingWaves_P2 [41 marks] A loudspeaker emits sound towards the open end of a pipe. The other end is closed. A standing wave is formed in the pipe. The diagram represents the displacement of molecules of air in the pipe at an instant of time. 1a. Outline how the standing wave is formed. [1 mark] X and Y represent the equilibrium positions of two air molecules in the pipe. The arrow represents the velocity of the molecule at Y. 1b. Draw an arrow on the diagram to represent the direction of motion of the molecule at X. [1 mark] 1c. Label a position N that is a node of the standing wave. [1 mark] 1d. The speed of sound is 340 m s 1 and the length of the pipe is 0.30 m. Calculate, in Hz, the frequency of the sound. [2 marks]
2 The loudspeaker in (a) now emits sound towards an air water boundary. A, B and C are parallel wavefronts emitted by the loudspeaker. The parts of wavefronts A and B in water are not shown. Wavefront C has not yet entered the water. 1e. The speed of sound in air is 340 m s 1 and in water it is 1500 m s 1. [2 marks] The wavefronts make an angle θ with the surface of the water. Determine the maximum angle, θ max, at which the sound can enter water. Give your answer to the correct number of significant figures. 1f. Draw lines on the diagram to complete wavefronts A and B in water for θ < θ. max [2 marks]
3 A longitudinal wave is travelling in a medium from left to right. The graph shows the variation with distance x of the displacement y of the particles in the medium. The solid line and the dotted line show the displacement at t=0 and t=0.882 ms, respectively. The period of the wave is greater than ms. A displacement to the right of the equilibrium position is positive. (i) Calculate the speed of this wave. 2a. (ii) Show that the angular frequency of oscillations of a particle in the medium is ω= rads 1. [4 marks]
4 One particle in the medium has its equilibrium position at x=1.00 m. 2b. (i) State and explain the direction of motion for this particle at t=0. [4 marks] (ii) Show that the speed of this particle at t=0.882 ms is 4.9ms 1.
5 The travelling wave in (b) is directed at the open end of a tube of length 1.20 m. The other end of the tube is closed. 2c. (i) Describe how a standing wave is formed. [3 marks] (ii) Demonstrate, using a calculation, that a standing wave will be established in this tube.
6 This question is about simple harmonic motion (SHM), wave motion and polarization. A liquid is contained in a U-tube. 3a. [7 marks] The pressure on the liquid in one side of the tube is increased so that the liquid is displaced as shown in diagram 2. When the pressure is suddenly released the liquid oscillates. The damping of the oscillations is small. (i) Describe what is meant by damping. (ii) The displacement of the liquid surface from its equilibrium position is x. The acceleration a of the liquid in the tube is given by the expression a = 2g l x where g is the acceleration of free fall and l is the total length of the liquid column. Explain, with reference to the motion of the liquid, the significance of the minus sign. (iii) The total length of the liquid column in the tube is 0.32m. Determine the period of oscillation.
7 3b. The string in (c) is fixed at both ends and is made to vibrate in a vertical plane in its first harmonic. [6 marks] (i) Describe how the standing wave in the string gives rise to the first harmonic. (ii) Outline how a travelling wave in a string can be used to describe the nature of polarized light.
8 This question is about waves. The diagram represents a standing (stationary) wave in air in a pipe which is open at both ends. Two points in the pipe are labelled P and Q. (i) State the direction of oscillation of an air molecule at point P. 4a. (ii) Compare the amplitude of oscillation of an air molecule at point P with that of an air molecule at point Q. [3 marks]
9 4b. A hollow pipe open at both ends is suspended just above the ground on a construction site. [2 marks] Wind blows across one end of the pipe. This causes a standing wave to form in the air of the pipe, producing the first harmonic. The pipe has a length of 2.1 m and the speed of sound in air is 330 ms 1. Estimate the frequency of the first harmonic standing wave. 4c. The pipe is held stationary by the crane and an observer runs towards the pipe. Outline how the frequency of the sound measured by the observer is different from the frequency of the sound emitted by the pipe. [3 marks] International Baccalaureate Organization 2018 International Baccalaureate - Baccalauréat International - Bachillerato Internacional Printed for HAEF (Psychico College)
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Friday 18 January 2013 Morning AS GCE PHYSICS A G482/01 Electrons, Waves and Photons *G411580113* Candidates answer on the Question Paper. OCR supplied materials: Data, Formulae and Relationships Booklet
Sound All sound begins with a vibrating object Ex. Vibrating tuning fork Vibrating prong sets molecules near it in motion
Sound All sound begins with a vibrating object Ex. Vibrating tuning fork Vibrating prong sets molecules near it in motion As prong swings right, air molecules in front of the movement are forced closer
From Last Time Wave Properties. Doppler Effect for a moving source. Question. Shock Waves and Sonic Booms. Breaking the sound barrier.
From Last Time Wave Properties Interference: waves can superimpose constructively or destructively Two speakers can be quieter than one! Doppler effect Frequency shift (up or down) from moving source.
describe sound as the transmission of energy via longitudinal pressure waves;
1 Sound-Detailed Study Study Design 2009 2012 Unit 4 Detailed Study: Sound describe sound as the transmission of energy via longitudinal pressure waves; analyse sound using wavelength, frequency and speed
THIS IS A NEW SPECIFICATION
THIS IS A NEW SPECIFICATION ADVANCED SUBSIDIARY GCE PHYSICS A Electrons, Waves and Photons G482 *OCE/23017* Candidates answer on the Question Paper OCR Supplied Materials: Data, Formulae and Relationships
(A) 2f (B) 2 f (C) f ( D) 2 (E) 2
1. A small vibrating object S moves across the surface of a ripple tank producing the wave fronts shown above. The wave fronts move with speed v. The object is traveling in what direction and with what