Velocity of light Concordance
Velocity of light
Section titled “Velocity of light”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
75 hits
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9 sources
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19 sections
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Matched Aliases
Section titled “Matched Aliases”Velocity of light, velocity-of-light
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Four Lectures on Relativity and Space | 39 | 3 |
| Radiation, Light and Illumination | 10 | 2 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 8 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 5 | 2 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 5 | 2 |
| General Lectures on Electrical Engineering | 4 | 2 |
| Theory and Calculation of Alternating Current Phenomena | 2 | 2 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 1 | 1 |
| Theoretical Elements of Electrical Engineering | 1 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 2: Conclusions From The Relativity Theory - 26 hit(s)
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... by forces acting between the ether atoms so as to hold them together in their relative positions. Bodies in which the atoms are held together in their relative positions are solid bodies. That is, trans- verse waves can exist only in solid bodies. As the velocity of light is extremely high, the forces between the ether atoms which transmit the vibrations must be very great. That is, the ether is a solid body of very high rigidity, infinitely more rigid than steel. At the same time, the ether must be of extremely high ten ...Lecture 3: Gravitation And The Gravitational Fleld - 10 hit(s)
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... of inertial motion to an accelerated system. The law of gravitation thus appears here as such a mathematical transformation to an acceler- ated system and has been derived in this manner by Einstein. For all velocities which are small compared with the velocity of light Einstein's law of gravitation and Newton's law give the same results, and a difference appears only when the velocity of the moving bodies approaches in magnitude the velocity of light, as is the case, for instance, with ionic motions. Thus the gravitat ...Lecture 1: Nature And Different Forms Of Radiation - 7 hit(s)
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... mp or the rays of the moon. The most conspicuous form of radiation is light, and, therefore, it was in connection with this form that the laws of radiation were first studied. 1 2 RADIATION, LIGHT, AND ILLUMINATION. 2. The first calculations of the velocity of light were made by astronomers in the middle of the eighteenth century, from the observations of the eclipses of the moons of Jupiter. A number of moons revolve around the planet Jupiter, some of them so close that seen from the earth they pass behind Jupiter a ...Chapter 2: Long-Distance Transmission Line - 4 hit(s)
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CHAPTER II. LONG-DISTANCE TRANSMISSION LINE. 3. If an electric impulse is sent into a conductor, as a trans- mission line, this impulse travels along the line at the velocity of light (approximately), or 188,000 miles per second. If the line is open at the other end, the impulse there is reflected and returns at the same velocity. If now at the moment when the impulse arrives at the starting point a second impulse, of opposite directio ...Lecture 10: Continual And Cumulative Oscillations - 3 hit(s)
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... r electrifying force, (27) ROUND PARALLEL CONDUCTORS. 137 G e and K = - — -„ = - — -, = dielectric field intensity, (28) where v- is the reduction factor from the electrostatic to the electromagnetic system of units, and y = 3 X 10^0 cm. sec. = velocity of light; (29) the dielectric density then is D = kK = -^j, (30) 4 TTVH where k = specific capacity of medium, = 1 in air. The dielectric flux then is where A = section of dielectric flux. Or inversely: e = i^^^. (32) If then "^ = dielectric flux, in Fi ...Lecture 10: Inductance And Capacity Of Round Parallel Conductors - 3 hit(s)
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... e, (27) 128 ELECTRIC DISCHARGES, WAVES AND IMPULSES. and K = - — 2 = - — ^ = dielectric field intensity, (28) 4 Trf 4 irV L where v2 is the reduction factor from the electrostatic to the electromagnetic system of units, and v = 3 X 1010 cm. sec. = velocity of light; (29) the dielectric density then is where K = specific capacity of medium, = 1 in air. The dielectric flux then is where A = section of dielectric flux. Or inversely: -IS?* : || (32) If then ^ = dielectric flux, in Fig. 60, at a distance x from ...Lecture 4: The Characteristics Of Space A. The Geometry Of The Gravitational Field - 3 hit(s)
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LECTURE IV THE CHARACTERISTICS OF SPACE A. THE GEOMETRY OF THE GRAVITATIONAL FIELD The starting point of the relativity theory is that the laws of nature, including the velocity of light in empty space, are the same everywhere and with regard to any system to which they may be referred — whether on the revolving platform of the earth or in the speeding railway train or in the space between the fixed stars. From this it follows that the l ...Lecture 2: Relation Of Bodies To Radiation - 3 hit(s)
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... necessary to analyze the mixed radiation given by a source as a lamp, by resolving it into its component waves. This is done by using some feature of the radiation which varies with the frequency. Such is the case with the velocity of propagation. The velocity of light in empty space is 3 X 1010 cm. per sec. It is practically the same in air and other gases. In denser bodies, however, as water, glass, etc., the velocity of light is less and, as will be seen, is different for different frequencies. 22 RADIATION, LIG ...Lecture 2: The Electric Field - 2 hit(s)
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... nsity, where /c is a constant of the material, the electrostatic or dielectric conductivity, and is called the spe- cific capacity or permittivity. For empty space, and thus with close approximation for air and other gases, 1 where v = SX W is the velocity of light. It is customary, however, and convenient, to use the permit- tivity of empty space as unity: k = 1. This changes the unit of dielectric-field intensity by the factor -^ , and gives : dielectric-field intensity, K = j^; (21) 4 Try- ^ ^ dielectric ...Lecture 2: The Electric Field - 2 hit(s)
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... constant of the material, the electrostatic or dielectric conductivity, and is called the spe- cific capacity or permittivity. For empty space, and thus with close approximation for air and other gases, 1 K — ~9» VL where v = 3 X 1010 is the velocity of light. It is customary, however, and convenient, to use the permit- tivity of empty space as unity: K = 1. This changes the unit of dielectric-field intensity by the factor — , and gives: dielectric-field intensity, dielectric density, = T^-oJ (21) 4 T ...Lecture 7: High Frequency Oscillations And Surges - 2 hit(s)
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... d the complete wave length would thus be two miles. Or, if a momentary discharge occurs over a lightning arrester to ground, the wave length may be only a few feet. The velocity with which the electric wave travels in an overhead line is practically the velocity of light, or about 188,000 miles per second: it would be exactly the velocity of light, except that by the resistance of the line conductor the velocity is very slightly reduced. In an underground cable, by the high capacity of the cable insulation, the velocity o ...Lecture 17: Arc Lighting - 2 hit(s)
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... ' seconds, assuming two half- waves as an average, gives 500,000 cycles. The frequency of oscillation of the lightning flash thus appears to be of the magnitude of half a million cycles. Since the velocity of propagation of electric disturbances is the velocity of light, or 188,000 miles per second, the wave length of a discharge of 500,000 cycles is ^qq'qqq = g miles, or about 2000 feet. A wave length of 2000 feet means that the current in the discharge flows in one direction for 1000 feet, in the opposite direction, ...Chapter 1: General Equations - 2 hit(s)
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... ength of the circuit- may be chosen as is convenient, thus : the centimeters in the high- frequency oscillation over the multigap lightning arrester circuit, or a mile in a long-distance transmission circuit or high-potential cable, or the distance of the velocity of light, 300,000 km., etc. The permanent values of current and e.m.f. in such circuits of distributed constants have, for alternating-current circuits, been investigated in Section III, where it was shown that they can be treated as transient phenomena in space, ...Chapter 7: Numerical Calculations - 1 hit(s)
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... ess telegraphy, lightning protection, etc., we get new functions. If ^=/(0 is the current in the conductor, as function of the time t, at a distance x from the conductor the magnetic field lags by the X time ti = -, where S is the speed of propagation (velocity of light). Since the field intensity decreases inversely propor- tional to the distance x, it thus is proportional to y= — - — ; (41) and the total magnetic flux then is / 2= j ydx A'-l) -j^T^'i' <*2) If the current is an alternating current, that is, f ( ...Theory Section 19: Fields of Force - 1 hit(s)
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... transition from the electric quantity "gradient" to the dielectric quantity " field intensity," a numer- ical factor 4 irv2 enters, the one quantity being based on the volt as unit, the other on unit force action, v is the velocity of light, 3 X 1010, and the factor v2 the result of the convention of assum- ing the permittivity of empty space as unity. It is now easy to remember, where in the electromagnetic system of units the factor 4-Tr enters: it is ...Chapter 14: Dielectric Losses - 1 hit(s)
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... e absolute value of the current thus is: g^ i = ViTTi? = ^Vy' + (2x/A;)2 and the power consumption: or, since the dielectric density D is proportional to the voltage € ... gradient t and the permittivity: D= '^ 4.irvH (where y = 3 X 10^" = velocity of light, see "Theoretical Ele- ments of Electrical Engineering.") Thus: ^ ~ k^ where V = Al = volume The power-factor then is: ^ ei Vy'-h (2 7r/A;)2 DIELECTRIC LOSSES 153 Or, if, as usually the case, the conductivity 7 is small compared with the su ...Chapter 15: Distributed Capacity, Inductance, Resistance, And Leakage - 1 hit(s)
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... rrent. Besides this, there is the increase of ohmic resistance due to unequal distribution of current, which, however, is usually not large enough to be noticeable. Furthermore, the electric field of the conductor progresses with a finite velocity, the velocity of light, hence lags behind 174 ALTERNATING-CURRENT PHENOMENA the flow of power in the conductor, and so also introduces power components, depending on current as well as on potential difference. 132. This gives, as the most general case, and per unit length ...Chapter 8: Velocity Of Propagation Of Electric Field - 1 hit(s)
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... ld is considered as in phase with the current, the electrostatic component as in phase with the voltage. In reality, however, the electric field starts at the conductor and propa- gates from there through space with a finite though very high velocity, the velocity of light; that is, at any point in space the electric field at any moment corresponds not to the condi- tion of the electric energy flow at that moment but to that at a moment earlier by the time of propagation from the conductor to the point under consideration, ...