Place the discoveries

Exercise and reference answers

End

1930

Start

1880

Events

1. Year

   1887

   Item

   Hertz makes radio waves

2. Year

   1888

   Item

   Hallwachs charges a plate

3. Year

   1905

   Item

   Einstein explains it

4. Year

   1913

   Item

   Millikan oil drop

5. Year

   1924

   Item

   de Broglie hypothesis

Instructions

Drag each milestone to its year on the line.

Explanation