Which statement about progressive longitudinal waves is not correct?
A The oscillations of the particles are parallel to the direction of travel of the wave energy.
B They have a series of nodes and antinodes.
C They need a medium through which to travel.
D They transfer energy.
A bicycle gear wheel is a disc with 50 ‘teeth’ equally spaced around its edge, as shown. The gear wheel is rotated 10 times each second. A springy strip of metal is vibrated by the rotating ‘teeth’.
The metal strip produces a sound of frequency that is equal to the frequency of vibration of the strip.
The speed of sound in air is 330 m.s^–1.
What is the wavelength of the emitted sound?
Two wave sources are oscillating in phase. Each source produces a wave of wavelength λ. The
two waves from the sources meet at point X with a phase difference of 90°.
What is a possible difference in the distances from the two wave sources to point X?
Which statement about electromagnetic waves in a vacuum is correct?
A Amplitude is inversely proportional to velocity.
B Frequency is inversely proportional to wavelength.
C Intensity is proportional to amplitude.
D Velocity is proportional to wavelength.
A transverse wave travels along a rope.
The graph shows the variation of the displacement of the particles in the rope with distance along it at a particular instant.
At which distance along the rope do the particles have maximum upwards velocity?