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Astrophysics/Deviation of emr under infulence of gravity
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Question
Greetings!!
can you tell me what was the actual deviation of emr passing by the star, in the famous Einstein's experiment, does gravity effect light?
and can you please tell me any equation for the devation in radian measure??
Hello,
In the reference I have ('Gravitation and Spacetime', 2nd ed. by Hans O'Hanion and Remo Ruffini) the deflection is given as:
theta = (-1. 75 arcsec)
The equation that yields it (sorry, but not in radians) is:
theta = 4 G M_s/ R_s c^2
where G is the Newtonian graviational constant, M_s is the solar mass, R_s is the solar radius and c is the speed of light.
(The Einstein exp. as you are aware - measured the deflection for light from a distant star passing near the SUN)
The conversion of any arcsec value to radians is not difficult - since 1 rad = 57.3 deg = 206,300 arcsec.
Thus, the magnitude of 1.75 arcsec = 8.483 x 10^-6 rad
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Philip A. Stahl
Expertise
I specialize in stellar and solar astrophysics. Can answer any questions pertaining to these areas, the spectroscopic analysis of stars – as well as the magneto-hydrodynamics of sunspots and solar flares. Sorry – No homework problems done or research projects! I will provide hints on solutions.
Experience
Have published papers on the relationship between sunspot morphology and solar flares; discovery of SID flares related to this, constructed computerized stellar models; MHD research.
Organizations
American Astronomical Society (Solar physics and Dynamical astronomy divisions), American Geophysical Union, American Mathematical Society, Intertel.
Publications
Solar Physics, Journal of the Royal Astronomical Society of Canada, Journal of the Barbados Astronomical Society, Meudon Solar Flare Proceedings (Meudon, France). Books: 'Selected Analyses in Solar Flare Plasma Dynamics', 'Physics Notes for Advanced Level'.
Education/Credentials
B.A. degree in Astronomy; M.Phil. degree in Physics - specializing in solar physics.
Awards and Honors
Postgraduate research award- Barbados government; Studentship Award in Solar Physics - American Astronomical Society
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