Augus- tin Fresnel A HUNDRED years ago physical science received one of the greatest contributions ever made by a single man. This achievement was the establishment of the undulatory theory of light by the Frenchman, Augus- tin Fresnel.
What is the meaning of Undulatory?
: of or relating to undulation : moving in or resembling waves : undulating.
What is Undulatory propulsion?
Undulatory locomotion is the type of motion characterized by wave-like movement patterns that act to propel an animal forward. Examples of this type of gait include crawling in snakes, or swimming in the lamprey.
What is the law of undulation?
Their nearest approach to constancy, therefore, is undulationthe repeated return to a level from which they repeatedly fall back, a series of troughs and peaks.
What is walking the walk?
informal. : to do the things that one says one will do As the saying goes, Don’t talk the talk unless you can walk the walk!
How does Undulatory locomotion work?
Undulatory locomotion is a means of self-propulsion that relies on the generation and propagation of waves along a body. As a mode of locomotion it is primitive and relatively simple, yet can be remarkably robust.
What is Undulatory swimming?
Undulatory swimmers are animals that generate a travelling wave along their body or propulsive fins to push fluid backwards. Examples include eels, lampreys and some rays.
What is Anguilliform swimming?
anguilliform swimming A type of swimming practised by highly flexible fish such as eels, in which most of the body length undulates such that over a half a sinusoidal wave is formed.
What does Ungulation mean?
ungulate. noun. Definition of ungulate (Entry 2 of 2) : a hoofed typically herbivorous quadruped mammal (such as a pig, cow, deer, horse, elephant, or rhinoceros) of a group formerly considered a major mammalian taxon (Ungulata) see artiodactyl, perissodactyl.
Why does Screwtape turn into a centipede?
The Giant Centipede Screwtape explains becoming a centipede as an external sign of his inner Life Force, a positive sign. … This, says Screwtape, is how the poet John Milton described such occurrences in Hell. It can be seen as an irresistible change caused by his growing anger at Wormwood.
What is the point of the Screwtape Letters?
Written in defense of Christian faith, this popular satire consists of a series of 31 letters in which Screwtape, an experienced devil, instructs his young charge, Wormwood, on effective strategies for tempting the human being assigned to him and making sure he continues on a steady path toward damnation.
Do you walk the talk?
(idiomatic, US) To do what one said one could do, or would do, not just making empty promises.
What do you call someone who walks the walk?
Pedestrian comes from the Latin pedester meaning going on foot but also plain. As a noun, it’s someone walking around sidewalks are for pedestrians.
What is another way to say walk the talk?
For the rest of us, the saying is if you’re going to talk the talk, you’ve got to walk the walka modern version of old sayings like actions speak louder than words and practice what you preach. Another early form of the expression was walk it like you talk it.