- #1
jmm5872
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A vertically pulsed laser fires a 800 MW pulse
of 220 ns duration at a small 8 mg pellet at
rest. The pulse hits the mass squarely in the
center of its bottom side.
The speed of light is 3 × 108 m/s and the
acceleration of gravity is 9.8 m/s2.
If the radiation is completely absorbed
without other effects, what is the maximum
height the mass reaches?
Answer in units of μm.
Pressure*Area = Force = ma
F = dp/dt
p = E/c
I'm not even sure where to start. I guess I need to figure out the relation between Power and energy to get the momentum. From that I can get the force and then acceleration, etc...
Any hints would be appreciated
of 220 ns duration at a small 8 mg pellet at
rest. The pulse hits the mass squarely in the
center of its bottom side.
The speed of light is 3 × 108 m/s and the
acceleration of gravity is 9.8 m/s2.
If the radiation is completely absorbed
without other effects, what is the maximum
height the mass reaches?
Answer in units of μm.
Pressure*Area = Force = ma
F = dp/dt
p = E/c
I'm not even sure where to start. I guess I need to figure out the relation between Power and energy to get the momentum. From that I can get the force and then acceleration, etc...
Any hints would be appreciated