Here's a breakdown:

* Photoelectric effect: A photon interacts with an electron in a material, causing the electron to be ejected. This is an absorption process where energy is transferred from the photon to the electron.

* Bremsstrahlung (braking radiation): An electron interacts with the electric field of an atom's nucleus, causing the electron to decelerate and emit a photon. This is an emission process where energy is transferred from the electron to the photon.

Key differences:

* Energy transfer: In the photoelectric effect, energy is absorbed from the photon, while in bremsstrahlung, energy is emitted by the electron.

* Particle interaction: The photoelectric effect involves a photon interacting with an electron, while bremsstrahlung involves an electron interacting with an atomic nucleus.

* Result: The photoelectric effect results in an ejected electron, while bremsstrahlung results in a photon.

Applications:

* Photoelectric effect: Used in photomultipliers, light detectors, and solar cells.

* Bremsstrahlung: Used in X-ray tubes, where high-speed electrons are slowed down by a metal target to generate X-rays.

In essence, the photoelectric effect is the absorption of a photon and the emission of an electron, while bremsstrahlung is the emission of a photon and the deceleration of an electron. They are complementary processes involving the same fundamental interaction between photons and charged particles.