Examples of The Doppler Effect in the following topics:
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- The Doppler Effect is the change in a wave's perceived frequency that results from the source's motion, the observer, and the medium.
- The Doppler effect is a periodic event's change in frequency for an observer in motion relative to the event's source.
- Most people have experienced the Doppler effect in action.
- The Doppler effect can be caused by any kind of motion.
- If the observer moves relative to the stationary siren, the observer will notice the Doppler effect on the pitch of the siren.
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- The Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.
- In this atom, we are going to cover the Doppler effect , but specifically when the observer is the one in motion.
- While the frequency will change whether the observer or sound source is moving, it is easier to show with the sound source as the one moving.
- The angle of the line of sight from the observer to the sound source, $\theta$
- The first video describes the basics of sound while the second video looks at the Doppler Effect.
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- The Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.
- What is the observed frequency of the horn as the train approaches the observer?
- While the frequency will change whether the observer or sound source is moving, the effect is more easily demonstrated by the sound source.
- This Doppler Effect is illustrated in .
- The angle of the line of sight from the observer to the sound source, $\theta$
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- The Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.
- The name of this is called the Doppler effect, named for the scientist who discovered it.
- His name was Christian Doppler, and he discovered it around 1840 in Prague.
- If the observer is moving away from the sound source, the frequency will be lowered, and if the observer moves closer to the sound source, the frequency is increased.
- Compare change in the frequency due to the doppler effect when the object in motion moves towards or away from the other object
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- In all but the last of these examples the energy of the photon is shifted due to the Doppler effect.
- The $T$ is the temperature of the gas and $m_a$ is the mass of the atoms.
- Both of these effects result in a Lorentz profile for the line of the form
- The first two terms are the lifetime of the upper and lower states and $\nu_\mbox{col}$ is the frequency of collisions.
- The Gaussian convolution of the Lorentz profile profiles has a special name: the Voigt function
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- We have a radio transmitter in the primed frame radiating at a frequency $\omega'$.
- According to the time dilation, in the unprimed frame it oscillates more slowly at a time interval $\bigtriangleup t=2\pi \gamma / \omega$.
- The time between the arrival for two crests of the wave in the unprimed frame is given by,
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- The momentum the photons carry is a conserved quantity (i.e., it cannot be destroyed) so it must be transferred to the surface; thus the absorption of the light beam causes the surface to gain momentum.
- In laser cooling (sometimes called Doppler cooling), the frequency of light is tuned slightly below an electronic transition in the atom.
- Because light is detuned to the "red" (i.e., at lower frequency) of the transition, the atoms will absorb more photons if they move towards the light source, due to the Doppler effect.
- Since the initial momentum loss was opposite to the direction of motion (while the subsequent momentum gain was in a random direction), the overall result of the absorption and emission process is to reduce the speed of the atom.
- The streams of dust and gas thus released form an atmosphere around the comet (called the coma), and the force exerted on the coma by the Sun's radiation pressure and solar wind cause the formation of an enormous tail that points away from the Sun.
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- A sonic boom is the sound associated with the shock waves created by an object traveling through the air faster than the speed of sound.
- A sonic boom is the sound associated with the shock waves created by an object traveling through the air faster than the speed of sound.
- It can be viewed as a Doppler effect on steroids; sonic booms generate an enormous amount of energy, and sound like explosions.
- This version of a Doppler effect is demonstrated by .
- An observer hears the boom when the shock wave, on the edges of the cone, crosses his or her location
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- The Compton Effect is the phenomenon of the decrease in energy of photon when scattered by a free charged particle.
- It results in a decrease in energy (increase in wavelength) of the photon (which may be an X-ray or gamma ray photon), called the Compton Effect.
- Still, the origin of the effect can be considered as an elastic collision between a photon and an electron.
- However, the effect will become arbitrarily small at sufficiently low light intensities regardless of wavelength.
- The Compton Effect is the name given to the scattering of a photon by an electron.
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- As shown in previous atoms, when two waves with the same frequency combine, the resulting pattern is determined by the phase difference between the two.
- One beam is reflected in the direction of A and the other is transmitted through the surface of M to the point B.
- It has played an important role in studies of the upper atmosphere, revealing temperatures and winds (employing both space-borne and ground-based instruments) by measuring the Doppler widths and shifts in the spectra of airglow and aurora.
- The best known application of the Michelson Interferometer is the Michelson-Morley experiment—a failed attempt to demonstrate the effect of the hypothetical "aether wind" on the speed of light.
- This diagram of a Michelson Interferometer shows the path that the light waves travels in the instrument.