Use doppler shift. The frequency is frame dependent. The difference in the observed frequencies of the two speakers will be the beat frequency. The frequency of the speaker towards which the person is moving will have an observed increase, and the other will have an observed decrease, from the nominal 438 Hz.mayo2kett said:Two loudspeakers face each other, vibrate in phase, and produce identical 438-Hz tones. A listener walks from one speaker toward the other at a constant speed and hears the loudness change (loud-soft-loud) at a frequency of 3.3 Hz. The speed of sound is 343 m/s. What is the walking speed?
A standing wave is a type of vibration that occurs when two waves with the same frequency and amplitude travel in opposite directions and interfere with each other. This interference causes certain points, known as nodes, to remain stationary while other points, known as antinodes, oscillate between maximum and minimum amplitude.
The properties of a standing wave include the number of nodes and antinodes, the wavelength, the amplitude, and the frequency. These properties can be manipulated by changing the frequency or wavelength of the two interfering waves.
Standing waves are created when two waves with the same frequency travel in opposite directions and interfere with each other. This can happen when a wave is reflected back upon itself, such as in a closed tube or on a string fixed at both ends.
The main difference between a standing wave and a traveling wave is that a standing wave remains in one place and does not transfer energy, while a traveling wave moves through a medium and transfers energy.
Standing waves have various applications in fields such as acoustics, electronics, and optics. Some examples include musical instruments like guitars and violins, microwave ovens, and laser beams. Standing waves are also used in medical imaging techniques like ultrasound and MRI.