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8.1. Stationary waves
A subsection of Physics, 9702, through 8. Superposition
Listing 10 of 102 questions
A tube is initially fully submerged in water. The axis of the tube is kept vertical as the tube is slowly raised out of the water, as shown in . air column loudspeaker surface of water water wall of tube A loudspeaker producing sound of frequency 530 Hz is positioned at the open top end of the tube as it is raised. The water surface inside the tube is always level with the water surface outside the tube. The speed of the sound in the air column in the tube is 340 m s–1. Describe a simple way that a student, without requiring any additional equipment, can detect when a stationary wave is formed in the air column as the tube is being raised. Determine the height of the top end of the tube above the surface of the water when a stationary wave is first produced in the tube. Assume that an antinode is formed level with the top of the tube. height = m Determine the distance moved by the tube between the positions at which the first and second stationary waves are formed. distance = m
9702_w21_qp_22
THEORY
2021
Paper 2, Variant 2
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A progressive longitudinal wave travels through a medium from left to right. shows the positions of some of the particles of the medium at time t0 and a graph showing the particle displacements at the same time t0. displacement X Y Z direction of wave travel distance Particle displacements to the right of their equilibrium positions are shown as positive on the graph and particle displacements to the left are shown as negative on the graph. The period of the wave is T. On , draw circles around two particles which are exactly one wavelength apart. On , sketch a line on the graph to represent the displacements of the particles for the longitudinal wave at time t0 + T 4 . State the direction of motion of particle Z at time t0 + T 4 . The frequency of the wave in is 16 kHz. The distance between particles X and Y is 0.19 m. Calculate the speed of the wave as it travels through the medium. speed = m s–1 A longitudinal sound wave is travelling through a solid. The initial intensity of the wave is I0. The frequency of the wave remains constant and the amplitude falls to half of its original value. Determine, in terms of I0, the final intensity of the wave. intensity = I0 The sound wave in now meets another sound wave travelling in the opposite direction. State a condition necessary for these two waves to form a stationary wave. State two ways in which a stationary wave differs from a progressive wave.
9702_w22_qp_23
THEORY
2022
Paper 2, Variant 3
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Questions Discovered
102