8.1. Stationary waves
A subsection of Physics, 9702, through 8. Superposition
Listing 10 of 102 questions
A long tube, fitted with a tap, is filled with water. A tuning fork is sounded above the top of the tube as the water is allowed to run out of the tube, as shown in . A loud sound is first heard when the water level is as shown in , and then again when the water level is as shown in . illustrates the stationary wave produced in the tube. On , sketch the form of the stationary wave set up in the tube, mark, with the letter N, the positions of any nodes of the stationary wave. Use 32.4 cm tuning fork 512 Hz [T The frequency of the fork is 512 Hz and the difference in the height of the water level for the two positions where a loud sound is heard is 32.4 cm. Calculate the speed of sound in the tube. speed = …………………… m s–1 The length of the column of air in the tube in is 15.7 cm. Suggest where the antinode of the stationary wave produced in the tube in is likely to be found.
9702_s06_qp_2
THEORY
2006
Paper 2, Variant 0
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State what is meant by the frequency of a progressive wave, the speed of a progressive wave. One end of a long string is attached to an oscillator. The string passes over a frictionless pulley and is kept taut by means of a weight, as shown in . string pulley oscillator weight The frequency of oscillation is varied and, at one value of frequency, the wave formed on the string is as shown in . Explain why the wave is said to be a stationary wave. State what is meant by an antinode. On , label the antinodes with the letter A. A weight of 4.00 N is hung from the string in and the frequency of oscillation is adjusted until a stationary wave is formed on the string. The separation of the antinodes on the string is 17.8 cm for a frequency of 125 Hz. The speed v of waves on a string is given by the expression v = T m , where T is the tension in the string and m is its mass per unit length. Determine the mass per unit length of the string. mass per unit length = kg m–1
9702_s08_qp_2
THEORY
2008
Paper 2, Variant 0
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Questions Discovered
102