character: Alexander Graham Bell
topic: Development of the Telephone
grade: 9
subject: Physics
LearnActions
SearchCreate
character: Heinrich Hertz
topic: Discovery of Electromagnetic Waves
grade: 9
subject: Physics
LearnActions
SearchCreate
character: Thomas Edison
topic: Improvement of Telephone Technology
grade: 9
subject: Physics
LearnActions
SearchCreate
character: James Clerk Maxwell
topic: Theory of Electromagnetic Radiation
grade: 9
subject: Physics
LearnActions
SearchCreate