#1
Apr2803, 09:22 AM

P: n/a

Since the gravity of a black hole affects light, does a baem of light accelerate when it nears a black hole ? Just wondering.




#2
Apr2803, 01:23 PM

P: 80

No




#3
Apr2803, 02:05 PM

Emeritus
Sci Advisor
PF Gold
P: 10,424

Physicists refer to any change in the velocity vector an acceleration, though  so yes, the light does accelerate. Its velocity vector does not change in magnitude however, which means the light does not change speed.  Warren 


#4
Apr2803, 02:31 PM

P: n/a

C not constant ?when direction changes there are all three: normal, tangentional and torsional changes of the vector. and how exactly do you find light to be cabable of traveling? is it in a sense light changes position? in my room now the lights are on.where do i find the light now? how do i ensure the light after awhile has gone from there? finally can you put light on bread and eat it? 



#5
Apr2803, 04:37 PM

P: 499

dock, what the heck?? Are you capable of making sensible posts at all anymore, and even of understanding extremely basic vector mechanics?




#6
Apr2803, 05:01 PM

Emeritus
PF Gold
P: 8,147

A light beam always follow the shortest path through the vacuum. If space is flat that path is a straight line. But near a gravitational source it is a curved line, called a geodesic. Light follows it.
The gravitational potential will not acclerate the ligh, but it will change its frequency. For light, momentum is exhibited as frequency according to the equation momentum equals planck's constant times frequency. p=h[nu]. 



#8
Apr2803, 06:29 PM

Astronomy
Sci Advisor
PF Gold
P: 22,809

I used & nu ; (without the spaces) is there another way to get nu? Let's try [ nu ] (w/o the spacing) E = h[nu] E/c = h[nu]/c 


#9
Apr3003, 11:28 AM

P: n/a




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