Gap Fill - A Zeptosecond - Level 0

HOW TO PLAY:

  • Choose the correct word from the drop-down menus below.
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.
  • After this paragraph, go to Paragraph 2.

   decimal      fast      it      just      molecule      photon      time      tools      trillionth      zeros  

Paragraph 1

Scientists measured the shortest unit of ever. It is a zeptosecond - a of a billionth of a second. It is a point followed by 20 and then a 1. The scientists used special to measure how long takes a to cross a hydrogen . It took 247 zeptoseconds. This is too for us to see.

Now go to   Paragraph 2.

Back to the zeptosecond lesson.

Share this lesson

More Free Sites by Sean Banville

Online Activities

Print

Read
Grammar
Spell
Words