[填空题]
A loudspeaker is placed near the open end of a tube which is closed at the other end.
The length of the tube is 0.45 m and the speed of the sound wave in the air is $340\,ms^{−1}$.
(1)Identify with ticks [✓] the properties of the standing waves and travelling waves.
Standing WavesTravelling Waves All particles vibrate with the same amplitude Particles one wavelength apart vibrate in the same phase Energy is not transferred along the wave
(2)Waves are also classified as transverse and longitudinal. Explain why longitudinal waves are generated by the speaker.
(3)Show that the lowest frequency of a sound wave that will form a standing wave in the tube is approximately 190 Hz.$F$= Hz
2.In a school concert, two coherent loudspeakers are used in an open area. A student suggests that the quality of the sound that different spectators hear will be affected due to interference. Explain how the interference of sound waves can affect the quality of the sound.
