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21.

Focus

Landmarks: Photons are Real

Phys. Rev. Focus 13, 8 (2004) – Published February 20, 2004

In 1923, Arthur Compton convinced most skeptics that in some experiments, light can act like a stream of particles, rather than waves.

22.

Focus

Momentum From Nothing

Phys. Rev. Focus 13, 3 (2004) – Published January 23, 2004

A theorist predicts that an object immersed in electromagnetic fields can move by pulling momentum out of empty space.

23.

Focus

Apply Quantum Principle with Caution

Phys. Rev. Focus 4, 26 (1999) – Published November 19, 1999

Niels Bohr’s famous correspondence principle–that classical and quantum physics must agree under certain conditions–is not correct the way he and many modern textbooks have stated it.

24.

Focus

Photons on Demand

Phys. Rev. Focus 4, 17 (1999) – Published October 1, 1999

Physicists have developed a system that emits single photons on a precise schedule.

25.

Focus

The One-Electron Cyclotron

Phys. Rev. Focus 4, 11 (1999) – Published August 19, 1999

Physicists have captured a single electron cirulating in a magnetic field and observed its transitions among 5 different energy levels.

26.

Focus

Matter and Light Swap Roles

Phys. Rev. Focus 4, 5 (1999) – Published July 26, 1999

Researchers have caused ‘matter waves’ to immitate x-rays by diffracting them through ‘crystals of light’.

27.

Focus

Size Matters

Phys. Rev. Focus 2, 16 (1998) – Published October 8, 1998

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