Loudness, or volume, is the way that the human ear perceives sound. At its simplest, when the amplitude is increased, sound gets louder, and when it is decreased, sound gets quieter.Know More
There are two things that contribute to our perception of sound. The first is the amplitude of the sound and the second is the frequency of the sound. Both of these things are precise measurements of sound rather than a perception.
This change in loudness brought on by an increase in amplitude is not proportionate. It all comes down to waveforms and how they vibrate. It is these vibrations that make sound. Amplitude affects the size of the vibration, while the frequency affects the speed of the vibration. This is what gives sound its pitch.
So, a sound with the same level of amplitude but a different frequency will have a different loudness to the human ear. For example, a bass sound will sound quieter than a mid-range sound even when both have the same amplitude. But if the amplitude of the bass sound is increased, its volume will increase and it will become louder.
Finally, the amount of increased volume that is achieved by an increase in amplitude is also affected by the frequency. So, turning the amplitude level in the mid-range sound from the previous example will not have the same proportional effect on loudness as the bass sound.Learn More
Although both sound and light are fast by human standards, light is far faster than sound because waves of sound must propagate through a medium, while the speed of light is tied to fundamental universal constants. Light travels at about 300,000 kilometers per second, and the speed of sound is usually around 300 meters per second.Full Answer >
Infrared is used for keeping things warm, reading information and checking heat. The uses for infrared technology are so diverse because infrared not only detects heat but produces heat in objects that it strikes.Full Answer >
X-rays work by passing electromagnetic radiation through the body to create an image on film or on a digital device, thus providing diagnostic imaging. They are a part of the electromagnetic spectrum that includes visible light, ultraviolet light and infrared red heat. X-rays are shorter in wavelength than visible light and heat.Full Answer >
Magnification makes objects look bigger, while resolution increases the amount of detail that can be seen on an object. Microscopes are used to both magnify objects and resolve them.Full Answer >