? about light

2,538
1
if we had a scale with a mirror on top then we zeroed the scale and the scale was on earth well in our case we need a stronger gravitational
field and a light beam comes by the scale and then enters the strong gravitational field
thus the light is bent into the scale and hits the mirror and bounces off would the scale register a weight? all-be it a small one. or if we had a space-craft in outter space with mirrors on it and we shined a huge laser at it would the space-craft move , for every action there is an equal but opposite reaction.
 
27,180
3,814
Yes. Light has momentum.
 
2,538
1
does this imply that light has mass, cause if the scale registers weight
w=mg i know p=E/c for a photon
 
2,538
1
i see that makes sense now .
 

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top