Start with the equation:
Rearrange the equation for time to get:
Distance = 300
speed = 20
Insert into the new equation:
15 seconds is your answer
Answer:
434.0 V/m
Explanation:
The power output of the laser is:
while the radius of the beam is
so the cross-sectional area is
So the intensity of the laser beam is
The intensity of a laser beam is related to the magnitude of the electric field by
where
c is the speed of light
is the vacuum permittivity
Solving the formula for E, we find
Protons are positive +
Neutrons are neutral and have no charge
Electrons are negative -
number of protons in a nucleus