The velocity is always to the line of a circle

The velocity is always tangent to the line of a circle .

Explanation:

When an object moves in a circular path, its motion is called the circular motion. The speed of the object is constant at each and every point in such motion while the velocity changes due to change in direction.

In a circular motion, the direction of velocity is always tangent to the circle. At  each and every point, its direction is found tangentially.

photocells convert light energy to electricity

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right