How does a gravitational redshift differ from a doppler shift?
A “gravitational redshift” is the frequency (speed) change of a photon (light) in a gravitational field. A “Doppler shift” is a more generic description of the phenomenon of a wavelength shift due to external forces. Light and sound both exhibit doppler shifts when they are part of a moving object (Airplanes, planets, trains). The incoming perspective is compressed – a “blue shift ...
Is it true that light escaping from white dwarfs will show a ...
2015年12月23日 · Yes. The small size and high density of white dwarf stars means that the gravitational red shift is much stronger than for less dense stars like our sun. A typical white dwarf might have a similar mass to our sun but be about 1/100th of the diameter. Since gravity is inversely proportional to the square of the distance, that means that the surface gravity of a …
What is the difference between a doppler redshift and a ... - Socratic
2017年9月29日 · Can't Summarize... In Doppler redshift, only the relative velocities of the emitting and receiving object matters. After the light is emitted, it doesn't matter if the object disappears or explodes or gets eaten by a monster. That light continues to travel with same frequency and wavelength. But in case of Cosmological redshift, the emitted light also gets stetched out …
If one object has a large redshift and another object has a tiny ...
2015年11月28日 · The two objects are moving away from the observer at different relative velocities. Redshift and blueshift are phenomena that occur when an object is moving relative to an observer. It is called the Doppler effect. If an object moves towards an observer, it will have a blueshift. The frequency of light, sound and any other information sent by the object and …
What is the difference between gravitational ... - Socratic
2018年1月2日 · The four, so called force, all operate at different ranges and on different particles in different ways. First of all the term force is not really accurate for the four interactions. A force is something which causes objects to accelerate. Only one of the interactions actually does this and this is only a part of the possible interactions. Electromagnetism is the interaction between …
What is the redshift of the Andromeda galaxy? | Socratic
2018年4月13日 · Slightly negative, so actually a blueshift. The Andromeda galaxy is moving towards our galaxy and due to collide in about 4.5 xx 10^9 years.
What is an example of gravitational interaction? - Socratic
2015年12月27日 · The earth and the moon. It is the earth's gravity which keeps the moon in its orbit. It is the moon gravity which causes the tides on the oceans of the earth.
Does gravitational force get weaker with distance? How ... - Socratic
2015年11月23日 · Yes it get weaker because it depends upon the inverse of the square of the distance (or separation). The gravitational force between two objects of mass m_1 and m_2 separated by a distance r is given as: F_("grav")=G(m_1*m_2)/r^2 Where G is the Universal Gravitational Constant=6.67xx10^-11 (Nm^2)/(kg^2)
What does redshift imply? - Socratic
2015年12月2日 · Redshift implies that the galaxy is moving away from us. When an observed galaxy is moving away from Earth, the light radiating from the galaxy increases in wavelength, which implies that the galaxy is moving away, as the distance between the galaxy and Earth is getting larger. Blueshift, in contrast, implies that the observed galaxy is moving towards Earth, …
What will gravitational waves help astronomers study?
2016年5月24日 · detection of gravitational waves open up a new way of studying universe. Astronomy with Electro magnetic radiations visible light ,Gama rays, X rays infra red etc Neutrino astronomy now gravitational waves. Collision of black holes. neutron stars, supernova explosions. and such high energy releasing explosions.