5-speed listening (A Zeptosecond - Level 1)

A zeptosecond - the shortest unit of time ever measured






Try  A Zeptosecond - Level 0  |  A Zeptosecond - Level 2  |   A Zeptosecond - Level 3

ESL resource book with copiable worksheets and handouts - 1,000 Ideas and Activities for Language Teachers / English teachers
See a sample

This useful resource has hundreds of ideas, activity templates, reproducible activities for …

  • warm-ups
  • pre-reading and listening
  • while-reading and listening
  • post-reading and listening
  • using headlines
  • working with words
  • moving from text to speech
  • role plays,
  • task-based activities
  • discussions and debates
and a whole lot more.

More Listening

20 Questions  |  Spelling  |  Dictation


Today, things are getting shorter. Scientists just measured the shortest unit of time ever recorded. It is a zeptosecond. This is tiny - a trillionth of a billionth of a second. It is a decimal point followed by 20 zeros and then a 1. The scientists study atomic physics. They used special tools to measure how long it takes a photon to cross a hydrogen molecule. The scientists said it took 247 zeptoseconds for this to happen. This is too fast for humans to see.

In 1999, a scientist measured the speed at which molecules change their shape. He found this was one femtosecond, which is a millionth of a billionth of one second. One millisecond is a thousandth of one second. This is the time it takes a neuron in our brain to fire. One nanosecond is one billionth of one second. The shortest unit of time it may be possible to measure is one Planck. This is a decimal point followed by 44 zeros and a 1.

Other Levels

All Levels

This page has all the levels, listening and reading for this lesson.

← Back to the zeptosecond  lesson.

Online Activities

Help Support This Web Site

  • Please consider helping Breaking News English.com

Sean Banville's Book

Thank You