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Form 3 Physics Wave II Questions and Answers
What determines the quality of a musical note?
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Answer Text:
- Overtones or harmonics
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1.
State two ways by which the frequency of a note produced by a given guitar wire may be increased.
2.
In an experiment using a ripple tank the frequency f of the electric pulse generator was reduced to one third of its value. How does the new wavelength compare with the initial wavelength? Explain your answer.
3.
Name the property of light that shows that it is a transverse wave.
4.
State a characteristic of sound, which is determined by overtone
5.
The pitch of the note produced by a wire depends on the tension in the wire. State the other factor that affects the pitch.
6.
Circular water waves generated by a point sources at the centre, O of the pond are observed to have the pattern shown in fig 6 Explain the pattern.
7.
What characteristic of sound is applied in tuning pianos?
8.
Explain how a piece of a palaroid reduces the sun’s glare.
9.
In an experiment to observe interference of light waves a double slit is placed close to the source. See fig 3. (i) State the function of the double slit. (ii) Describe what is observed on the screen. (iii) State what is observed on the screen when I. The slit separation #S_1S_2# is reduced. II. White light source is used in placed of monochromatic source.
10.
Figure 12 shows an experimental arrangement #S_1S_2# and S are narrow slits. State what is observed on the screen when the source is? (a) Monochromatic (b) White light
11.
Figure 7 shows two loud speakers L1 and L2 connected to a signal generator. One observer walks along line OO’ and another line AA’ for some distance. Describe the observations made by each observer and give reasons for your answer.
12.
What determines the quality of a musical note?
13.
Figure 11 shows a double slit placed in front of a source, S of waves. A detector D is placed beyond the slits, such that its position can be adjusted along the line XY. State with a reason, what the detector records along XY.
14.
In the young’s double slit experiment and interference pattern of bright and dark fridges was formed as shown in figure 1 by a light of wavelength ?? coming from two narrow slits X and Y. (a) Write an expression for the path difference between XP and YP where P corresponds to the 2nd bright fringe. (b) Explain how the dark and bright fringes are formed. (c) State and explain what would be observed
15.
A wire is stretched between two fixed points such that when it is plucked, it produces sound. Explain why the pitch of the sound produced may become lower when the temperature of the surrounding rises.
16.
Figure 10 shows water waves incident on a shallow region of the shape shown with dotted line. On the same diagram, sketch the wave pattern in and beyond the shallow region.
17.
Name two factors other than tension, which determine the frequency of sound from a stretched wire at room temperature.
18.
Figure 12 shows water waves incident on an aperture AB. On the same diagram, sketch the waves after going through the aperture.
19.
Figure 6I shows the cross- section of a ripple tank full of water. A piece of cork floats on the surface of the water as shown. Figure 6II shows the water surface viewed from above. A straight edge vibrator placed at the end A of ripple tank generates water waves, which travel towards end B as shown. (i) Identify the type of waves generated on the water surface. (ii) It is observed that as the
20.
Figure 15 shows an experimental arrangement for determining the wavelength of light. State and explain the difference in the patterns observed on the screen other than the difference in colour when the source of red light is replaced by a source of violet light.
21.
Figure 15 shows water waves of different wavelengths incident on identical apertures A and B. Complete the diagrams to show the pattern of the waves beyond the aperture in each case.
22.
Figure 16 shows wave fronts in a ripple tank approaching a shallow region in the tank. Complete the diagram to show the wave front as they pass over the shallow region and after leaving the region.
23.
Figure 5 shows wave fronts approaching a concave surface. Complete the diagram to show the wave fronts formed after striking the surface. Show how the focal point of the surface is located.
24.
Figure 5(a) and (b) show wave fronts incident on barriers blocking part of the path. On the same figure sketch the wave front to show the behavior of the waves as they pass each barrier and after passing the barrier.
25.
Figure 5 shows wave fronts approaching the boundary between two media. The speed of the waves in medium (2) is higher than that in medium (1). On the diagram, complete the figure to show the wave fronts after crossing the boundary.
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