EM Waves and Color
... Light travels faster in air than in water. Molecules in its way slows light down It is the opposite of sound waves, which require a medium to move faster ...
... Light travels faster in air than in water. Molecules in its way slows light down It is the opposite of sound waves, which require a medium to move faster ...
Electromagnetic Waves
... • Different atoms/molecules have different “spring strengths” - so different natural frequencies. • If this natural freq = that of impinging light, resonance occurs (recall ch 20) i.e. vibrations of electrons build up to high amplitudes, electrons hold on to the energy for “long” times, while passin ...
... • Different atoms/molecules have different “spring strengths” - so different natural frequencies. • If this natural freq = that of impinging light, resonance occurs (recall ch 20) i.e. vibrations of electrons build up to high amplitudes, electrons hold on to the energy for “long” times, while passin ...
Blank Jeopardy - prettygoodphysics
... (A) Its speed in a vacuum is 3 x 10^8 m/s. (B) It has a charge equal and opposite to that of an alpha particle. (C) It is more penetrating than a gamma ray of the same energy. (D) It has a mass of about 1,840 times that of a proton. (E) It can exhibit wave properties. ...
... (A) Its speed in a vacuum is 3 x 10^8 m/s. (B) It has a charge equal and opposite to that of an alpha particle. (C) It is more penetrating than a gamma ray of the same energy. (D) It has a mass of about 1,840 times that of a proton. (E) It can exhibit wave properties. ...
Chapter 1: Physics Basics (PDF file)
... Electricity consists of the range of physical phenomena which result from the presence of electric charge. Magnetism consists of phenomena which result from the motion of charge. The fields of electricity and magnetism are unified by Maxwell's equations. These equations describe a wave associated wi ...
... Electricity consists of the range of physical phenomena which result from the presence of electric charge. Magnetism consists of phenomena which result from the motion of charge. The fields of electricity and magnetism are unified by Maxwell's equations. These equations describe a wave associated wi ...
Space For Refection
... Particle Theory and Wave Theory Light can be reflected, refracted and diffracted. These three things are called “wave behaviour” so light must travel as a ...
... Particle Theory and Wave Theory Light can be reflected, refracted and diffracted. These three things are called “wave behaviour” so light must travel as a ...
1. Modern Optics: Introduction - University of Toronto Physics
... light must be like sound. So he modeled light as pressure variations in a medium (aether). ...
... light must be like sound. So he modeled light as pressure variations in a medium (aether). ...
Waves
... two transparent media, some will reflect back into the first medium, the rest will refract into the second media. Remember that light can either refract towards the normal (when slowing down while crossing the boundary) or away from the normal (when speeding up while crossing the boundary). ...
... two transparent media, some will reflect back into the first medium, the rest will refract into the second media. Remember that light can either refract towards the normal (when slowing down while crossing the boundary) or away from the normal (when speeding up while crossing the boundary). ...
Electromagnetic Waves File
... When an EM wave hits an antenna, the free electrons in the antenna will be forced to vibrate (by induction). If a simple circuit is connected to the antenna and the circuit is tuned, so that a narrow band of frequency will cause the electrons to resonate. This signal is the amplified and sent to the ...
... When an EM wave hits an antenna, the free electrons in the antenna will be forced to vibrate (by induction). If a simple circuit is connected to the antenna and the circuit is tuned, so that a narrow band of frequency will cause the electrons to resonate. This signal is the amplified and sent to the ...
158 The components of light
... electronic shell of an atom consists of certain, well-defined orbitals. However, the shell can also be decomposed is a different way, and this is indeed done, when it is convenient. These parts or contributions is then given the somewhat daunting name hybrid orbitals. To the student it appears as so ...
... electronic shell of an atom consists of certain, well-defined orbitals. However, the shell can also be decomposed is a different way, and this is indeed done, when it is convenient. These parts or contributions is then given the somewhat daunting name hybrid orbitals. To the student it appears as so ...
physics 100 prac exam#4
... E. contains small amounts of red dust that give the air its red color. 29. EM waves tend to be scattered the most by an object that is A. magnetic. B. a liquid. C. conducting. D. about the same size as the wave. E. reflective. ...
... E. contains small amounts of red dust that give the air its red color. 29. EM waves tend to be scattered the most by an object that is A. magnetic. B. a liquid. C. conducting. D. about the same size as the wave. E. reflective. ...
Electromagnetic Waves
... This is the exception to the rule that says that all waves in a given medium travel at the same speed (we learned this for sound waves in a previous chapter). In a material medium, EM waves exhibit a phenomenon called DISPERSION, where the index of refraction depends on the frequency of the light. H ...
... This is the exception to the rule that says that all waves in a given medium travel at the same speed (we learned this for sound waves in a previous chapter). In a material medium, EM waves exhibit a phenomenon called DISPERSION, where the index of refraction depends on the frequency of the light. H ...
Light Waves
... Which type of electromagnetic radiation is used to kill cancer cells? a.microwaves c.ultraviolet rays b.gamma rays d.sunlight ...
... Which type of electromagnetic radiation is used to kill cancer cells? a.microwaves c.ultraviolet rays b.gamma rays d.sunlight ...
if there is any current in the river
... speed. But then it would be slowed a compensating amount by the aether trapped inside the glass. The effect would be true for any transparent medium, Fresnel predicted, and would depend on its index of refraction -- a measurement of how much it effects the passage of light. Aether drag would thus be ...
... speed. But then it would be slowed a compensating amount by the aether trapped inside the glass. The effect would be true for any transparent medium, Fresnel predicted, and would depend on its index of refraction -- a measurement of how much it effects the passage of light. Aether drag would thus be ...
Chapter 33. Electromagnetic Waves
... are oscillating perpendicular to the direction in which the wave travels. The cross product E B always gives the direction in which the wave travels. • Electromagnetic waves can travel through a vacuum or a material substance. • All electromagnetic waves move through a vacuum at the same speed, an ...
... are oscillating perpendicular to the direction in which the wave travels. The cross product E B always gives the direction in which the wave travels. • Electromagnetic waves can travel through a vacuum or a material substance. • All electromagnetic waves move through a vacuum at the same speed, an ...
Speed of light
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its value is exactly 7008299792458000000♠299792458 metres per second (≈7008300000000000000♠3.00×108 m/s), as the length of the metre is defined from this constant and the international standard for time. According to special relativity, c is the maximum speed at which all matter and information in the universe can travel. It is the speed at which all massless particles and changes of the associated fields (including electromagnetic radiation such as light and gravitational waves) travel in vacuum. Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. In the theory of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.The speed at which light propagates through transparent materials, such as glass or air, is less than c; similarly, the speed of radio waves in wire cables is slower than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v). For example, for visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 7008200000000000000♠200000 km/s; the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 7008299700000000000♠299700 km/s (about 7004900000000000000♠90 km/s slower than c).For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects. In communicating with distant space probes, it can take minutes to hours for a message to get from Earth to the spacecraft, or vice versa. The light seen from stars left them many years ago, allowing the study of the history of the universe by looking at distant objects. The finite speed of light also limits the theoretical maximum speed of computers, since information must be sent within the computer from chip to chip. The speed of light can be used with time of flight measurements to measure large distances to high precision.Ole Rømer first demonstrated in 1676 that light travels at a finite speed (as opposed to instantaneously) by studying the apparent motion of Jupiter's moon Io. In 1865, James Clerk Maxwell proposed that light was an electromagnetic wave, and therefore travelled at the speed c appearing in his theory of electromagnetism. In 1905, Albert Einstein postulated that the speed of light with respect to any inertial frame is independent of the motion of the light source, and explored the consequences of that postulate by deriving the special theory of relativity and showing that the parameter c had relevance outside of the context of light and electromagnetism. After centuries of increasingly precise measurements, in 1975 the speed of light was known to be 7008299792458000000♠299792458 m/s with a measurement uncertainty of 4 parts per billion. In 1983, the metre was redefined in the International System of Units (SI) as the distance travelled by light in vacuum in 1/7008299792458000000♠299792458 of a second. As a result, the numerical value of c in metres per second is now fixed exactly by the definition of the metre.