The Naked Scientists
  • Login
  • Register
  • Podcasts
      • The Naked Scientists
      • eLife
      • Naked Genetics
      • Naked Astronomy
      • In short
      • Naked Neuroscience
      • Ask! The Naked Scientists
      • Question of the Week
      • Archive
      • Video
      • SUBSCRIBE to our Podcasts
  • Articles
      • Science News
      • Features
      • Interviews
      • Answers to Science Questions
  • Get Naked
      • Donate
      • Do an Experiment
      • Science Forum
      • Ask a Question
  • About
      • Meet the team
      • Our Sponsors
      • Site Map
      • Contact us

User menu

  • Login
  • Register
  • Home
  • Help
  • Search
  • Tags
  • Member Map
  • Recent Topics
  • Login
  • Register
  2. Naked Science Forum
  3. On the Lighter Side
  4. That CAN'T be true!
  5. when we shut off the light in a room, what is the "speed" of darkness?
« previous next »
  • Print
Pages: [1]   Go Down

when we shut off the light in a room, what is the "speed" of darkness?

  • 12 Replies
  • 7587 Views
  • 0 Tags
    •

0 Members and 1 Guest are viewing this topic.

Offline Emilio Romero (OP)

  • Sr. Member
  • ****
  • 224
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« on: 13/05/2009 18:20:59 »
Ok, it gets dark pretty fast....  [;D]
Logged
 

Ethos

  • Guest
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #1 on: 14/05/2009 00:12:33 »
Quote from: Emilio Romero on 13/05/2009 18:20:59
Ok, it gets dark pretty fast....  [;D]
One unit of Plank time.............5.39124X10^-44 seconds

Nothing is darker than the mind of the suspicious.............Ethos
« Last Edit: 14/05/2009 00:19:10 by Ethos »
Logged
 

Offline Emilio Romero (OP)

  • Sr. Member
  • ****
  • 224
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #2 on: 14/05/2009 01:18:34 »
so, there is a speed of light, of darkness, of sound and silence...
 [:D] [:D] [::)]

Logged
 

Offline Don_1

  • Naked Science Forum King!
  • ******
  • 6889
  • Activity:
    0%
  • Thanked: 9 times
  • A stupid comment for every occasion.
    • View Profile
    • Knight Light Haulage
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #3 on: 14/05/2009 10:18:00 »
..... and the UK government have set up speed cameras for the lot!!!
Logged
If brains were made of dynamite, I wouldn't have enough to blow my nose.
 

Offline Fortran

  • Full Member
  • ***
  • 91
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #4 on: 14/05/2009 17:40:08 »
I measured the speed of darkness last night, it was light for about an hour and a quarter after the sun went down  so I estimate the speed of sdarkness to be around 34mph.
Logged
You are only smart if you are surrounded by fools, so have a bit more patience for those of us that are complete idiots!

I like this place, if they don't ban me I'll stay here.
 

Offline Emilio Romero (OP)

  • Sr. Member
  • ****
  • 224
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #5 on: 15/05/2009 00:29:51 »

great !!
 [:D] [:D] [:D]
Logged
 

Offline LeeE

  • Naked Science Forum King!
  • ******
  • 3382
  • Activity:
    0%
  • Thanked: 1 times
    • View Profile
    • Spatial
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #6 on: 15/05/2009 16:37:46 »
It depends upon the type of light that is being switched off.

An incandescent light bulb doesn't cool instantly and if you're not looking directly at the bulb when it's switched off it is sometimes possible to detect that the dimming of the room takes a small but perceptible period of time.

I've also noticed that one of my energy-saver bulbs sometimes flashes quite brightly a few times after it has been switched off.  I suspect this is due to stored charge in the bulb electronics, but I'm not sure about that - there appears to be no faults in the switch and I am happy that it is isolated when the flashes occur.
Logged
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!
 

Offline Fortran

  • Full Member
  • ***
  • 91
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #7 on: 15/05/2009 18:15:16 »
Ok time to put you all out of your misery, the speed of 'dark is the same as the speed of light. If the sun instantly dissappeared it would take some 8 min 20 secs before the last (direct) light (from the sun) hit the earth
« Last Edit: 15/05/2009 19:03:29 by Fortran »
Logged
You are only smart if you are surrounded by fools, so have a bit more patience for those of us that are complete idiots!

I like this place, if they don't ban me I'll stay here.
 

Offline Emilio Romero (OP)

  • Sr. Member
  • ****
  • 224
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #8 on: 15/05/2009 20:58:38 »
thus the speed of silence is the same as the speed of sound...  [;D]
Logged
 

Offline Fortran

  • Full Member
  • ***
  • 91
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #9 on: 15/05/2009 21:18:28 »
Quote from: Emilio Romero on 15/05/2009 20:58:38
thus the speed of silence is the same as the speed of sound...  [;D]
No, it took you a whole 2 hours for you to shut up! lol!
« Last Edit: 15/05/2009 21:20:59 by Fortran »
Logged
You are only smart if you are surrounded by fools, so have a bit more patience for those of us that are complete idiots!

I like this place, if they don't ban me I'll stay here.
 

Offline Emilio Romero (OP)

  • Sr. Member
  • ****
  • 224
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #10 on: 16/05/2009 01:41:52 »
touché... :)
Logged
 

Offline Yomi

  • Hero Member
  • *****
  • 548
  • Activity:
    0%
  • HERE IN AM TO TAKE AWAY THE NOBEL PRIZE
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #11 on: 07/06/2009 20:29:23 »
speed of darkness is same as speed of light
Logged
MAHESH
 

Offline scalyblue

  • First timers
  • *
  • 8
  • Activity:
    0%
    • View Profile
when we shut off the light in a room, what is the "speed" of darkness?
« Reply #12 on: 30/08/2009 09:03:20 »
Darkness is the absence of light; since it doesn't exist, it can't have a speed.  The light will stop radiating out of the bulb and traverse the room at the speed of light until it hits something, that reflected light will go to your retina to be processed into visual imagry

If you really want to be pendantic about it, your perception of the darkness happens at half the speed of light, plus the response time of your visual cortex.
Logged
 
  • Print
Pages: [1]   Go Up
« previous next »
Tags:
 

Similar topics (5)

If we put a mirror millions of light years away and reflected earth, could we see what earth looked like millions of years ago?

Started by thedocBoard Physics, Astronomy & Cosmology

 Replies: 9
Views: 11563 		Last post 20/05/2018 00:53:37
by raf21
What is a halogen light bulb? What halogen is used and why is this better?

Started by chrisBoard Technology

 Replies: 4
Views: 9494 		Last post 02/02/2010 11:17:45
by Mazurka
Is solar energy the same as light energy?

Started by FeliciaBoard Technology

 Replies: 6
Views: 19782 		Last post 19/03/2020 15:17:27
by Paul25
What is Time? If there was no light would Time cease to be?

Started by londounkmBoard Physics, Astronomy & Cosmology

 Replies: 291
Views: 100177 		Last post 27/06/2020 13:55:35
by Bill S
Why do we need to light the rocket fuel for a rocket to take off?

Started by GlentoranMarkBoard Physics, Astronomy & Cosmology

 Replies: 14
Views: 9641 		Last post 19/03/2020 18:07:14
by Bored chemist
There was an error while thanking
Thanking...
  • SMF 2.0.15 | SMF © 2017, Simple Machines
    Privacy Policy
    SMFAds for Free Forums
  • Naked Science Forum ©

Page created in 0.224 seconds with 68 queries.

  • Podcasts
  • Articles
  • Get Naked
  • About
  • Contact us
  • Advertise
  • Privacy Policy
  • Subscribe to newsletter
  • We love feedback

Follow us

cambridge_logo_footer.png

©The Naked Scientists® 2000–2017 | The Naked Scientists® and Naked Science® are registered trademarks created by Dr Chris Smith. Information presented on this website is the opinion of the individual contributors and does not reflect the general views of the administrators, editors, moderators, sponsors, Cambridge University or the public at large.