In a famous experiment done at the end of the 19th century, two ...

[soccerdreamer_17]

In a famous experiment done at the end of the 19th century, two metal electrodes were placed in an evacuated glass tube. A high voltage was applied between them. By using an appropriate metal for the cathode (e.g., sodium or potassium),
 
  it was found that a current could be made to flow when the cathode was illuminated with blue light, but no current would flow when red light was used, no matter how bright the light. Einstein was able to explain this strange phenomenon, and as a result, this experiment was considered the first experimental demonstration of
  A) the particle nature of light.
  B) the wave nature of electrons.
  C) the particle nature of electrons.
  D) the wave nature of light.
  E) the equivalency of electron and photons.

Question 2

Jane says that the magnitude of the torque exerted by a force of magnitude F is equal to the perpendicular distance from the axis of rotation r multiplied by F, while Jason insists that it is equal to the distance from the axis of rotation r
 
  multiplied by the magnitude of the perpendicular component of the force, F Who is right?

[bookworm410]

Answer to Question 1

A

Answer to Question 2

They are both right. Both answers are equivalent to  = F r sin, where  is the angle between the force and the radial line.

[soccerdreamer_17]

Thank you!

[bookworm410]

Always glad to help...