The "meters" measurements refer to the diameter of the objective (the main big-moose lens or mirror).
But light collection depends on the AREA of the objective, and that means the SQUARE of the diameter.
So if you double the 'size' if the telescope, it gathers FOUR TIMES as much light as before.
B. Closed because otherwise the energy would "escape"
Explanation:
For this problem we have to take into account the expression
J = I/area = I/(π*r^(2))
By taking I we have
I = π*r^(2)*J
(a)
For Ja = J0r/R the current is not constant in the wire. Hence
and on the surface the current is
(b)
For Jb = J0(1 - r/R)
and on the surface
(c)
Ja maximizes the current density near the wire's surface
Additional point
The total current in the wire is obtained by integrating
and in a simmilar way for Jb
And it is only necessary to replace J0 and R.
I hope this is useful for you
regards
Answer:
The periodic table illustrate some of the elements from Hydrogen to Calcium
Answer:
He is pink panther. How nerdy does he sound?
Explanation: