Ultrasonic waves are sound waves transmitted above the human-detectable frequency range, usually above 20,000 Hz. They are used by some animals and in medical or industrial technological devices.Continue Reading
Some ultrasound-emitting devices are used to silence barking dogs without hurting human hearing, because only dogs find the sounds intolerable. Similarly, some medical equipment for diagnosing health complications can produce ultrasonic sounds of 10 MHz and above. Such sounds do not harm human tissue.
Bats use high-frequency sounds to navigate and catch prey. The animals emit ultrasonic waves while moving at high speed and in pitch darkness. When the sounds are reflected back, bats can tell what exactly is in front of them.Learn more about Optics & Waves
According to Britannica, hertz are units of frequency, so 50 Hz contains less frequency than 60 Hz. These units are used to calculate electric currents, electromagnetic waves and sound.Full Answer >
The three aspects of sound waves are wavelength, frequency and amplitude. Wavelength describes the distance between each sound wave, and frequency relates to the number of waves counted in a specified amount of time. The energy in a sound wave is called amplitude.Full Answer >
Light travels faster than sound because sound waves can only travel as waves of pressure in a medium, whereas electromagnetic waves, of which light is made, move on their own even through vacuum. Light's speed decreases a little when it goes through various mediums, as electromagnetic waves interact with the medium at a subatomic level. Sound's speed depends on the medium through which it travels.Full Answer >
Three examples of mechanical waves are sound waves, slinky waves and water waves. Mechanical waves differ from electromagnetic waves because the energy is transferred through another medium, such as the metal in a slinky, rather than through a vacuum, such as light through outer space.Full Answer >