PAPER 2 THEORY QUESTIONS
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1 PAPER 2 THEORY QUESTIONS 1 (a) Water waves are transverse waves. Sound is a longitudinal wave. (i) Describe the difference between transverse waves and longitudinal waves. In your account, draw a diagram of each type of wave. (ii) Sound contains regions of compression and regions of rarefaction. Describe what is meant by a compression and by a rarefaction. (b) A ripple tank is used to demonstrate the reflection of water waves. (i) Draw a labelled diagram of a ripple tank. MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 1
2 (ii) Draw a diagram showing the reflection of waves from a plane barrier in a ripple tank. (c) Fig. 1.1 shows a water wave passing a floating log. The log is stationary. Fig. 1.1 The log is 6.0 m long and 5 complete waves take 10 seconds to pass point A. Determine (i) the wavelength of the water waves, (ii) the frequency of the water waves, wavelength =... (iii) the speed of the water waves. frequency =... speed =... MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 2
3 2 Fig. 2.1 shows circular wavefronts produced at the centre of a circular ripple tank. Fig. 2.1 Two corks, A and B, float on the water in the ripple tank. They move up and down on the surface of the water as the wave passes. The wavelength of the wave is 8.0 cm. Fig. 2.2 shows how the displacement of A varies with time. Fig. 2.2 (a) State the amplitude of the vibrations of A as the wave passes. amplitude =... (b) The horizontal distance between A and B is half the wavelength of the wave. On Fig. 2.2, sketch a graph to show how the displacement of B varies with time. (c) Use Fig. 2.2 to determine the frequency of the wave. (d) Calculate the speed of the wave. frequency =... speed =... 3 Fig. 3.1 shows part of a long, thin spring used to demonstrate a transverse wave. Fig. 3.1 MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 3
4 The wave shown in Fig. 3.1 has a frequency of 4.0 Hz. (a) (i) On Fig. 3.1, mark the direction the hand must move to make a transverse wave. (ii) Describe how the hand must move to make a transverse wave of frequency 4.0 Hz. (b) The speed of the wave is 0.80 m/s. Calculate its wavelength. State clearly the formula that you use. wavelength =. (c) State what must be done to double the wavelength of the wave on the spring. 4 A student produces wavefronts in a ripple tank to demonstrate refraction, as shown in Fig He places a sheet of glass under the water on the right-hand side of the tank. The arrows show the directions of movement of the wavefronts. Fig. 4.1 (a) State what is meant by a wavefront. (b) State what happens to each of the following quantities as the wavefronts change direction. (i) wavelength.. (ii) speed... (iii) frequency MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 4
5 (c) Waves in deep water have a wavelength of 1.2 m and a speed of 9.6 m / s. The wavelength of the waves in shallow water is 0.8 m. Calculate the speed of the waves in the shallow water. 5 A sound wave in air is illustrated in Fig speed =. Fig. 5.1 Points A, B, C and D are at the centres of regions of compression. (a) Describe what happens as one complete sound wave moves past a point. (b) The sound wave in Fig. 5.1 has frequency 2000 Hz and speed 320 m/s. (i) Define the frequency of a wave. (ii) Calculate the distance between points A and D. State clearly any equation that you use. distance =... MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 5
6 6 Fig. 6.1 is a full-scale diagram that represents a sound wave of frequency 5.1 khz in air. Fig. 6.1 (a) (i) On Fig. 6.1, mark the position of one compression with the letter C and of one rarefaction with the letter R. (ii) Using the full-scale diagram, measure the wavelength of this sound wave. (iii) Calculate the speed of sound in air. wavelength =... speed =... (b) A sound wave is longitudinal. Describe how a longitudinal wave differs from a transverse wave. 7 Fig. 7.1 shows the cone of a loudspeaker. Fig. 7.1 MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 6
7 (a) Sound is being produced. Describe in detail the behaviour of the cone and the air near to it. (b) The lowest frequency that a human can hear is 20 Hz. (i) State the highest frequency that a human with normal hearing can hear.. (ii) Calculate the longest wavelength of sound that a human can hear. The speed of sound in air is 340 m / s. wavelength =... 8 Fig. 8.1 shows one swimmer in a race starting before the signal. Fig. 8.1 The swimmer is called back by a loud, low-pitched sound from a loudspeaker positioned just at water level. The speed of sound in air is 330 m / s. (a) (i) Describe how the loudspeaker causes sound to travel through the air. (ii) Explain, in terms of wave properties, what is meant by loud and low-pitched. MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 7
8 (iii) The swimmer is 0.57 m from the loudspeaker when he hears the sound. Calculate the time taken for the sound to reach him through the air. time taken = (iv) Explain how the time taken differs when sound travels the same distance through air and through water. (b) The loudspeaker produces sound of frequency 0.20 khz. Calculate the wavelength of this sound. wave length = 9 Fig. 9.1 shows a student clapping in front of a vertical wall. The wall reflects the sound. The student changes the number of claps made in 1 minute until the reflection of each clap returns to her at exactly the same time as she makes the next clap. The speed of sound in air is 330 m/s. (a) Explain what is meant by speed. (b) Calculate the time between claps. Fig.9.1 (c) Calculate the number of claps in 1 minute. time =.. number of claps =.. MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 8
9 10 (a) The sound produced by a ringing phone consists of two notes, one after the other. Fig shows the trace on an oscilloscope screen produced by the first of the notes. Fig The second note is louder and has a higher pitch. (i) On Fig. 10.1, continue the trace to show what happens when the second note is sounding. (ii) Explain the differences between the two traces. (b) Fig.10.2 shows two new different sound trace R and S. Fig In each of the three spaces below, describe either a similarity or a difference between the sounds made by the two notes MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 9
10 11 Fig shows how ultrasound is used to produce an image of the heart. Fig (a) Define ultrasound. (b) The ultrasound has a wavelength of m. The speed of the ultrasound in the human body is 1500 m / s. Calculate the frequency of the ultrasound. frequency = (c) Ultrasound is a longitudinal wave. Describe how particles in the body move as the ultrasound passes. You may draw a diagram if you wish. (d) There are small bubbles of gas in the body. Explain why these bubbles expand and contract as the ultrasound passes. MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 10
11 12 (a) Describe a method for measuring the speed of sound in air. In your account, state clearly how the sound is made, what measurements are taken, how the result is calculated, one precaution to produce an accurate result (b) Ultrasound is used in quality control to detect cracks in metal. Pulses of ultrasound are sent into the metal from a transmitter. A detector is placed next to the transmitter on the front surface of the metal. Fig shows the oscilloscope trace of the ultrasound pulses produced if the metal contains no cracks. Fig One division along the x-axis represents s. Pulses labelled S are the pulses initially sent out from the transmitter. Each pulse labelled R is the reflection from the back surface of the metal of the previous pulse S. (i) Use Fig to calculate the number of pulses sent out by the source in one second. number =... MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 11
12 (ii) Suggest two reasons why the amplitude of R is less than the amplitude of S. (iii) Some time later, the piece of metal is tested again. It now has a small crack half-way between the front surface and the back surface. On Fig. 12.1, draw the position and size of the pulses produced by this crack. Label each of these pulses C. (iv) A second beam of ultrasound has a frequency of Hz and a speed of 4000 m / s in the metal. Calculate the wavelength of this ultrasound in the metal. wavelength = Ultrasound may be used to measure the depth of the sea. Fig shows a pulse of ultrasound sent down to the sea bed and the reflected pulse returning to the ship. Fig (a) Describe what is meant by ultrasound. (b) Fig is a cathode-ray oscilloscope (c.r.o.) trace of the pulses of ultrasound sent from the ship and the reflected pulses. Fig MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 12
13 The speed of ultrasound in water is 1500 m/s and the wavelength of the ultrasound wave is m. The time-base setting for the x-axis on the c.r.o. is 0.10 s/division. Calculate (i) the frequency of the ultrasound wave, frequency = (ii) the time taken for the ultrasound pulse to reach the sea bed, time taken = (iii) the distance to the sea bed. (c) The ship moves to a place where the sea is deeper. distance = (i) State and explain two changes that would occur to the reflected pulses on the c.r.o. trace. You may give diagrams of the old and new traces to show the changes. (ii) When the sea is more than 450 m deep, the ultrasound pulses must be sent out less often. Using data from Fig. 13.2, explain why this is necessary. MS / Sh.M / ST12 / Gr 10 / physics / Theory Questions/ Wave and Sound wave 13
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