Demonstration: this demonstration shows students that light has a particle property: it packages its energy in small packets...

Practical Activity 14-16

Demonstration: A little something to enliven teaching the photoelectric effect.

Practical Activity 14-16

No sooner do students see that light has a wave property (and have measured its wavelength) then this story is upset with...

Teaching Guidance 14-16

This episode introduces an important phenomenon. Light releases electrons from metal surfaces.

Lesson 16-19

Heinrich Hertz made perhaps the earliest recorded observation of the photoelectric effect in 1887, during his experiments on...

Stories from Physics 11-14 14-16 16-19

Philipp Lenard had been an assistant of Hertz and built on his work on the photoelectric effect. He discovered that the total...

Stories from Physics 11-14 14-16 16-19

In 1972, Apollo 17 astronauts in orbit around the Moon observed an unexpected phenomenon — what they described as bands...

Stories from Physics 11-14 14-16 16-19

•In his 1905 photoelectric paper, Einstein did not use the term photon, but referred to a ‘light quantum’. The word photon was...

Stories from Physics 11-14 14-16 16-19