On a wave diagram, it is the distance " a " from the vertical middle to the crest or trough of the wave: In terms of sound, it is how loud the sound is: In terms of light, it is how bright the light is: In terms of electron orbital probability densities, it is the relative probability electrons are found in those radial coordinates black is, it can be found more often :.
Related questions Question a7b0f. Question d7f Question a7b Why is light a transverse wave? Which electromagnetic waves have the highest frequency?
What do transverse waves and longitudinal have in common? The visible spectrum in humans is associated with wavelengths that range from to nm—a very small distance, since a nanometer nm is one billionth of a meter. Other species can detect other portions of the electromagnetic spectrum. Light that is visible to humans makes up only a small portion of the electromagnetic spectrum. In humans, light wavelength is associated with perception of color. Within the visible spectrum, our experience of red is associated with longer wavelengths, greens are intermediate, and blues and violets are shorter in wavelength.
The amplitude of light waves is associated with our experience of brightness or intensity of color, with larger amplitudes appearing brighter. Different wavelengths of light are associated with our perception of different colors. Like light waves, the physical properties of sound waves are associated with various aspects of our perception of sound. High-frequency sound waves are perceived as high-pitched sounds, while low-frequency sound waves are perceived as low-pitched sounds.
The audible range of sound frequencies is between 20 and Hz, with greatest sensitivity to those frequencies that fall in the middle of this range. As was the case with the visible spectrum, other species show differences in their audible ranges. For instance, chickens have a very limited audible range, from to Hz.
Our pet dogs and cats have audible ranges of about 70— Hz and 45— Hz, respectively Strain, The loudness of a given sound is closely associated with the amplitude of the sound wave. Higher amplitudes are associated with louder sounds. Loudness is measured in terms of decibels dB , a logarithmic unit of sound intensity. A typical conversation would correlate with 60 dB; a rock concert might check in at dB.
A whisper 5 feet away or rustling leaves are at the low end of our hearing range; sounds like a window air conditioner, a normal conversation, and even heavy traffic or a vacuum cleaner are within a tolerable range. However, there is the potential for hearing damage from about 80 dB to dB: These are sounds of a food processor, power lawnmower, heavy truck 25 feet away , subway train 20 feet away , live rock music, and a jackhammer.
Any one of these distance measurements would suffice in determining the wavelength of this wave. A longitudinal wave is a wave in which the particles of the medium are displaced in a direction parallel to the direction of energy transport. A longitudinal wave can be created in a slinky if the slinky is stretched out horizontally and the end coil is vibrated back-and-forth in a horizontal direction. If a snapshot of such a longitudinal wave could be taken so as to freeze the shape of the slinky in time, then it would look like the following diagram.
Because the coils of the slinky are vibrating longitudinally, there are regions where they become pressed together and other regions where they are spread apart. A region where the coils are pressed together in a small amount of space is known as a compression.
A compression is a point on a medium through which a longitudinal wave is traveling that has the maximum density. A region where the coils are spread apart, thus maximizing the distance between coils, is known as a rarefaction.
A rarefaction is a point on a medium through which a longitudinal wave is traveling that has the minimum density. While a transverse wave has an alternating pattern of crests and troughs, a longitudinal wave has an alternating pattern of compressions and rarefactions. As discussed above, the wavelength of a wave is the length of one complete cycle of a wave.
For a transverse wave, the wavelength is determined by measuring from crest to crest. A longitudinal wave does not have crest; so how can its wavelength be determined? The wavelength can always be determined by measuring the distance between any two corresponding points on adjacent waves. In the case of a longitudinal wave, a wavelength measurement is made by measuring the distance from a compression to the next compression or from a rarefaction to the next rarefaction.
On the diagram above, the distance from point A to point C or from point B to point D would be representative of the wavelength. The wavelength is the distance from crest to crest or from trough to trough or between any two corresponding points on adjacent waves. The wavelength is the distance from crest to crest, trough to trough, or from a point on one wave cycle to the corresponding point on the next adjacent wave cycle.
Physics Tutorial.
0コメント