The sound of the sun

This morning, I was laying in bed thinking about the sound the sun makes.  Do you know that nobody has heard the sun?  Sound waves need matter to propagate and space is a vacuum.  If sound could travel in a vacuum, would the sun make enough noise that we could hear it?

Light gets from the Sun to the Earth in 8.4 minutes.

Sound would 14 years to make the same trip assuming sea level atmosphere all the way to the sun.  However, add an iron rod between the Earth to the Sun, and noise would only take 343 days to make the trip because iron carries sound nearly 15 times faster than air.


The numbers in this calculation…

  • Speed of Light: 299,792,458 meters/second
  • Speed of Sound: 343 m/s
  • Speed of Sound in Iron: 5,130 m/s
  • Earth-Sun Distance: 152,000,000,000 meters
  • Time for Light: 507 seconds
  • Time for Sound: 443,148,688 seconds
  • Time for Sound in iron: 29,629,630 seconds

Where to find more information

Here is a list of readings that I’ve compiled for my classes and students over the years on topics relating to the intersection of technology and disaster, crisis, risk management.  This list is kept current as older material becomes obsolete and new materials is available.  Let me know what you think are solid reference materials on these topics. Continue reading Where to find more information

Apple Watch and Google Glass

I stopped wearing a watch when I got in the habit of checking my cell phone or looking at a wall clock for time.  I’ve also stopped wearing accessories (bracelets, rings, earrings and so on).  Really, at this time in my life, I’ve also stopped wearing ties.  The JawBone UP24 didn’t even stay on my wrist as It got in the way when I typed.

Google Glass and Apple Watch
Google Glass and Apple Watch

My big debate when the Apple Watch was announced was if I would wear it.  Dropping $400 on something I may or may not use is a tough call.  I already tried Google Glass and it didn’t stick. Continue reading Apple Watch and Google Glass

Multimodal Learning

Educators are in constant search for more efficient and effective ways to advance student learning.  Thus it is no surprise that educators have been interested in the often-quoted saying that:

We remember…

  • 10% of what we read
  • 20% of what we hear
  • 30% of what we see
  • 50% of what we see and hear
  • 70% of what we say
  • 90% of what we say and do

Unfortunately, these oft-quoted statistics are unsubstantiated.  This article: Multimodal-Learning-Through-Media breaks the myth of the “cone of learning” where people only remember 10% of what they read. Continue reading Multimodal Learning