What wavelenght would be measured for these waves by a stationary observer?
437661
This requires the use of doppler shift formula for a moving source and stationary observer:\n\nf = f0 ( v / ( v + u ) )\n\nf0 = actual frequency = 5\nv = speed of wave = 20\nu = relative velocity of source away from observer = -10\n(since travelling toward)\n\nf = observed frequency = 10 Hz\n\nNow velocity = v = fl = frequency * wavelength\n\nso wavlength l = v / f = 20 / 10 = 2m
897839
The angular change ratio from the planar field
1078871
you have not given the distance on screen D\nso i took D=5cm\n \nso displacement y=m*wavelenght*D/d\n                             =0.4152 cm\n\nand angle q=4.7469 degree\n\nok if you don understand then go on this link and put the values
1053820
Stationary in reference to what fixed point?
576638
La detectacion de luz ,como photon o como onda, depende del typo o metodo de experimento para explorar la naturaleza de la luz. La luz exhibe la characteristica de honda en experimentos de diffraccion e interferencia y exhibe characteristicas de particula en experimentos de ionizacion de atomos con radiacion de varias energias. La luz se mueve en linea recta a menos que es reflejada o desviada por el medio atraves cual viaja. La luz que proviene de estrellas y galaxias distantes provee informacion soble la velocidad de esas estrellas y galaxias porque la luz como onda es cambiada como es cambiado el sonido de un tren qhe primero se aproxima y despues se aleja. ( vea terminos como "red-shift" and "doppler effect") El sonido aumenta cuando el tren viene y despues mengua cuando el tren se va.
626652
the lowest frequency, like low-band radio has a wavelength of about 2-300ft, but theoretically if you could produce EM waves at frequencies much lower then that, you could get wavelenghts of even light years in length, but that's not very practical to do, i doubt if its even possible.
1028067
Imagine the light wave from a point source like the circular waves produced when you drop a stone in water.  As the wave moves out, each point on the wavefront behaves like its own point-source and the constructive/destructive interference of these "wavelets" cause the wave to continue to propagate.\n\nIn 3-dimensions, the light from the sun is like a spherical wave propagating out. The wavefront is perpendicular to the direction of travel. The sun is about 93 million miles away, so by the time the wavefront reaches the earth, the tangent to the "spherical" wavefront is essentially the same as the wavefront itself. Hence, it can be represented as a plane wave because the spherical nature of the wave becomes insignificant.\n\nHowever, with a "nearby" lamp, the spherical wavefront retains its shape - i.e., we cannot neglect the shape of the wavefront. The effect is similar to placing a ruler tangent to circles of different radii. A ruler placed alongside a circle of 93 million mile radius would be virtually indistinguishable from the circle itself.
123405
Do you mean refraction?
676092
Uses the Doppler effect to detect frequency shifts in the transmitted pulse caused by the radial velocity of detected targets.  The echos is processed through a series of RF filters &, based on the amount of frequency shift & angle of approach, the radar can then determine the true target velocity.\n\nMostly used in weather apps.\n\nPS. the speed of light is normally rounded to 3*10^8 meters/sec or 300,000,000 m/s.  Also Doppler is a guy's name.  (Christian Johann Doppler 1803-1853 Austrian physicist)
1032932
mass, length, time, current, luminous intensity and solid angle steradians r fundamental. Rest all can b expressed by these alone.\n\nDarren G - missed d last 1.\n\nSo ur ans is option D
20065
it has a wavelength of about 650 nm. divide the speed of light to the wavelength and obtain the frequency.
852104
The frequency in the number of times the wave vibrates in one second. \nIn your question, you probably have light.  The speed of light is 300,000km/s.  If you multiply the frequency and the wavelength, you get the speed.  That is v=lf\nThat 595nm is actually 595x10e-9m or 0,000000595m\nThe speed of light is 3x10e8m/s\nSo the frequency is\nf=v/l\nf=300000000/0.000000595\nf=504201680672268.91\nf=5.1e14 hertz
963067
Emission lines of different wavelength depending upon what is being studied.
881712
A Michelson interferometer is like a very very sensitive ruler that measures in wavelengths of light. Visible light has a wavelength between about 400 and 800nm (10^-9 meters). Thus the distances we can measure are pretty small.\n\nThe basic operation of a Michelson interferometer is like this: You take a laser (because laser light is monochromatic and coherent), and then split the beam. We need the light to be monochromatic, that is, having only one wavelength present (633nm for a HeNe laser, common in the lab). Once split, the laser is put on two different paths, these should be at right angles to each other. They are then reflected back along the same path and recombined. If the distance in one leg was greater than that in the other leg, we'll see an interference pattern due to the different number of wavelenghts that fit along the different paths.\n\nSo it is an instrument for measuring differential length. The idea was that you could use this to look for the "ether." This was an idea in the early 20th century that there must be some medium for light waves to "wave in." By analogy, water waves are movements in the medium of water. So there should be (the thinking went) that there is an ether that carries light waves.\n\nWell, the way to test  this idea is to think about how the earth moves. If there was an ether the earth would be moving through it at some speed, in the direction that the earth is moving, we'd measure a different speed of light than in a direction at a right angle (orthogonal) to the motion of the earth. So you set up your Michelson interferometer, and see if you can get interference patterns that could only be due to the different speeds of light in different directions.\n\nThe experiments revealed that there was no such thing as an ether.
69398
In some sense, it could be made up of individual particles.  But if you break down the particles far enough, they start to take on properties of waves as well as particles.  But the question is, if they are waves, what is there to do the waving?\n\nIf we observe the particles very closely, we can determine their exact positions - but the more precisely we determine their positions, the less we know about their momentum!  We can only draw a graph to represent the probability of a given particle's momentum _if_ it happened to be at a particular position, and there does not seem to be any way to exactly predict what its position or momentum might be at any given point in time, without measuring it.\n\nSo it could be that matter does not exist at all, unless it is being measured, or observed.  Could it be that what matter is made up of is...mind?
210577
distance measurements...btw...holographs have been developed (not the three beam version but the single immesion source)
55652
light density or intensity? if you're talking about intensity then it depends on distance. that's an inverse square relationship.