Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Isobar
   2. Protium
   3. Deuterium
   4. Tritium

   Odd item

   Isobar

2. Items

   1. Geiger
   2. Planck
   3. Marsden
   4. Rutherford

   Odd item

   Planck

3. Items

   1. Gold foil
   2. Alpha source
   3. Lead plate
   4. Black body

   Odd item

   Black body

Instructions

Tap the item that does not belong with the rest.

Explanation