Physics - Ch 66 Quantum Mechanics 2: Basic Concepts (14 of 38) What is Gravitation Redshift? 1

In this video I will calculate gravitational redshift photons experience when trying to escape Earth's gravitational force (Part 1).

Next video in this series can be seen at:

[dhickey]

Thank you for the video! I did a research assignment on cosmological red shift for chemistry. This is my first real exposure to red shift in the quantum domain.

[ironuranium]

here when light photon come to earth from the sun they lose some energy but according to this equation, Ef=Ei+mgH energy will increase how can we explain that?

[johntindell]

wow, very philosophically Thank you so much

[bangstar]

why did you substitute the radius of Earth? On the board R is the distance 3:40

[jovanovicoliver]

Thank you for the videos. Maybe your calculation for the Suns gravitational red shift is better in your next video. (Speaking from your and the general point of view, mine personal opinion is somewhat different).

[zakirhussain-jsku]

I think space around massive body is denser which reduces the wavelength & increases the frequency of incoming photon. Reverse happens to outgoing photon which moves from denser to rarer space.

[Langkowski]

Used to describe the relativity theory: "In a way gravity and acceleration were different ways to describe the same thing. This is where Einstein had a huge insight. The way to connect gravity in the theory of relativity was through the idea of acceleration, since the two are equivalent."

Also, the stronger the gravity, the slower the time. And the faster you accelerate, the slower the time.

When passing through the gravity field of a star or planet, light experience redshift. Light also experience redshift due to an expanding universe.

Space-time is stretched both by gravity and by the universe's expansion, so that photons has to cover a longer distance using the same amount of time.

Does this mean that time itself moves slower the more the universe expand, in a similar way that time moves slower in a gravity field?

[ironuranium]

when the photon hit the earth surface then their have still a potential energy - (GMm/r)? (r is the radius of earth)

[sunethrarajapaksha]

Why energy is losing when a photon escaping from gravitational field.

[cellerism]

Is it not redshit due to more space and also due to light losing energy by following the geodesic of space time?