The wrong statements among the following regarding photo electric effect–

• A

  Here photon and particle(electron) collision takes place and total energy is  conserved.

• B

  In this process total momentum is also conserved

• C

  If a monochromatic radiation of frequency more than the threshold frequency is used then all electrons come out with same kinetic energy

• D

  Photocells are used in invisible U–V region for burglar alarm.