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Can anyone give definition for Doppler frequency?
It is not Doppler frequency. It's Doppler effect. The APPARENT change in the frequency of the source as there is a relative motion between the source and the observer is defined as Doppler effect. The expression for frequency (apparent) is given fapparent = [(C - Vo + Vm)/(C-Vs+Vm)] x freal The condition to be kept in mind is that the source is on the left side and the observer on the right side along positive X axis. Vm - velocity of the medium and the medium is moving along positive X axis. Vo - the velocity of the observer Vs - the velocity of the source C - velocity of the wave either sound or light But in case of light Vm is not needed as the medium movement will not affect the velocity of the wave in any way.
Difference between rectilinear and linear motion?
Rectilinear motion is motion along a straight line, while linear motion is motion in a straight line in any direction. Rectilinear motion is restricted to motion along a single axis, while linear motion can occur along any direction in a straight line.
Is the motion of a body along a curved path translational?
No, the motion of a body along a curved path is not translational, as translational motion refers to straight-line motion. The motion of a body along a curved path involves a combination of translational and rotational motion due to changes in direction.
What are the types of translational motion?
The types of translational motion include rectilinear motion (motion along a straight line), curvilinear motion (motion along a curved path), and general plane motion (combination of translation and rotation).
What is the Relation between rectilinear and circular motion?
Rectilinear motion is motion along a straight line, while circular motion involves moving along a circular path. One can be seen as a special case of the other - circular motion can be decomposed into both rectilinear motion along the tangent and angular motion around the center.
Why the Doppler shift tells us only about the motion directly along the line of sight between a light source and an observer but not about motion across the celestial sphere?
The Doppler shift only measures the component of motion directly towards or away from the observer. Motion across the celestial sphere does not impact the frequency of light perceived by the observer along the line of sight. This is because the Doppler effect is only sensitive to changes in the relative velocity between the source and observer along the line connecting them.
Can anyone give definition for Doppler frequency?
It is not Doppler frequency. It's Doppler effect. The APPARENT change in the frequency of the source as there is a relative motion between the source and the observer is defined as Doppler effect. The expression for frequency (apparent) is given fapparent = [(C - Vo + Vm)/(C-Vs+Vm)] x freal The condition to be kept in mind is that the source is on the left side and the observer on the right side along positive X axis. Vm - velocity of the medium and the medium is moving along positive X axis. Vo - the velocity of the observer Vs - the velocity of the source C - velocity of the wave either sound or light But in case of light Vm is not needed as the medium movement will not affect the velocity of the wave in any way.
What method is used to determine a star's speed of approach?
The method used to determine a star's speed of approach is called "radial velocity." This technique measures the star's motion towards or away from us along the line of sight by analyzing the Doppler shift in its spectral lines. The amount of shift in the spectral lines provides information about the star's speed and direction of motion relative to us.
What does motion sensor detect?
There are a few different ones out there, but most of them work by the Doppler principle and on sound at ultrasonic frequencies. Doppler effect is the appearent shift in the frequency of a signal (wave) because of motion of the source or observer (or both) toward or away from each other. We've seen Doppler effect in action. Like with a train or race car. As the vehicle comes toward the observer, we hear a sound. As the vehicle zips by, the pitch or frequency of the sound drops. That's Doppler effect. By installing a small ultrasonic sound transmitter and receiver, an area of coverage is "painted" with the ultrasonic sound. Then the receiver along side it listens for an echo. If nothing in the room is moving toward or away from the source, all the returning signals will be the same as the ones that left the source. But if there is some relative motion, the detector "hears" the difference in the pitch of the sound (Doppler effect) and an alarm is triggered.
Difference between rectilinear and linear motion?
Rectilinear motion is motion along a straight line, while linear motion is motion in a straight line in any direction. Rectilinear motion is restricted to motion along a single axis, while linear motion can occur along any direction in a straight line.
Is the motion of a body along a curved path translational?
No, the motion of a body along a curved path is not translational, as translational motion refers to straight-line motion. The motion of a body along a curved path involves a combination of translational and rotational motion due to changes in direction.
What is circulatory motion?
It is the motion along a circular path.
What are the types of translational motion?
The types of translational motion include rectilinear motion (motion along a straight line), curvilinear motion (motion along a curved path), and general plane motion (combination of translation and rotation).
What is the Relation between rectilinear and circular motion?
Rectilinear motion is motion along a straight line, while circular motion involves moving along a circular path. One can be seen as a special case of the other - circular motion can be decomposed into both rectilinear motion along the tangent and angular motion around the center.
How does gravity effect motion?
Gravity is completely responsible for planetary motion. The shape and size of each orbit, and the speed of the planet at every point in its orbit, taken along with the mass of the sun, are completely determined by the behavior of gravity.
Why does the Doppler Effect detect only radial velocity?
This answer assumes that the reader has a fundantal knowledge of what Doppler effect and Doppler radar are. To be effective, Doppler radar, which is an application of the Doppler effect, must be used with the object moving right at or directly away from the Doppler source. It is possible to use Doppler radar on a target moving at a slant, but the angle of convergence or divergence would have to be known and calculations would have to be made to get a correct answer as to that object's velocity. In an situation where it is used to determine radial velocity, it would be tricky to get it to work in this application. Radial velocity is the movement of an object in a circle or an arc of a circle. If the radial velocity of an object was being was investigated, one could use Doppler radar. But there are some issues. Understand that the object is moving in an arc or a circle, like a ball on the end of a string that is being whirled about. The observer would probably want to stand outside the circumference of the circle. Then a "line of sight" would have to be set up to catch the tangent of the circle so the speed of the object could be sampled in an instant when it was moving directly at or away from the Doppler source. This is possible, but challenging. The radius would have to be measured (if it was not know) and a calculation would have to be made. With the radius of the path of travel measured, and the instantaneous speed discovered via the Doppler radar, a calculation would be rather simple. Note that the radial velocity found would be an instantaneous radial velocity. It the radar unit could not be used to sample an instant when the object was moving right at or directly away from the Doppler source, this would make the calculation really, really difficult. It is still mathematically possible to find an object's radial velocity by measuring the speed of an object that is not moving directly at or away from the source, but it's really, really hard. The angle of the objects path of travel with reference to the direction to the Doppler source would have to be known at the instant the radar imaged its speed. Some calculations could then be made. But it's tough. Certainly if the object under investigation is moving laterally with reference to the radar source (moving directly perpendicular to the line of sight from the radar unit), the source will not be able to see it as it is moving at a right angle to the radar. That means no Doppler effect with which the electronics can work to determine speed. Let's wrap up on this important note. When any object moves in anything but a straight line, its velocity is changing - even if its speed remains constant. That's because velocity is speed with a direction vector tacked on to it. An object moving on a radial path is constantly changing velocity, even if it's just changing direction and moving at a constant speed.
What is rectilinear motion?
The motion along a straight line is known as rectilinear motion.
