波的性質與波速：練習題

Which of the following statements correctly describes how waves transfer energy and information?

In a medical ultrasound scan, a pulse of frequency \(3.5\text{ MHz}\) is used. If the speed of ultrasound in human tissue is \(1540\text{ m/s}\), calculate the wavelength of this ultrasound wave.

A sound wave travels from a liquid into a solid. The frequency of the wave is \(2.0\text{ kHz}\). In the liquid, the wave travels at \(1500\text{ m/s}\). When it enters the solid, its speed increases to \(4000\text{ m/s}\). Calculate the change in the wavelength of the sound wave.

A sound wave has a frequency of \(500\text{ Hz}\) and a wavelength of \(0.68\text{ m}\). Calculate the velocity of the sound wave.

A sonar system on a ship sends a pulse of ultrasound to the seabed. The pulse is detected \(1.2\text{ s}\) after it was sent. If the speed of sound in water is \(1500\text{ m/s}\), what is the depth of the water?

A wave has a frequency of \(10\text{ Hz}\) and a wavelength of \(2\text{ m}\). Calculate the wave speed.

Describe the difference between longitudinal and transverse waves in terms of the direction of vibrations relative to the direction of wave travel.

Explain why a wave refracts when it passes from deep water into shallow water at an angle, in terms of its speed and direction.