Light Just
Light Just
What happens to all the light energy when you turn off a light switch?
How is it that an entire room can be illuminated by one small light source, yet when that source is stopped, every trace of light is gone?
Is it just instantly absorbed by the surrounding surfaces?
I would think there might be a brief moment where the residual light is reflected back and forth between the walls or something.
Would the effect be the same in a room with a completely reflective floor, ceiling, and walls? Or would the light energy bounce continuously off the walls, keeping the room illuminated even in the absence of continuous source of light?
I'm sure there is a simple explanation, but please, enlighten me.
Imagine you have a filament (light source) exactly at the center of 100 % reflective ball shaped wall vacuum room.
When you turn on the filament, what will happened ?
All the light emitted by the filament are bounced back exactly to the filament. The filament will glow brighter and brighter until you turn off the filament or the filament melt, and the filament will still glow even though no electricity supplied to it anymore.
(The filament glows brighter and brighter because it receive the reflected ray of light and converted back to heat at the filament while energy is still being fed to it until you turn off.)
Why?, because no energy is left the room and no energy is absorbed by the wall.
This won't happened in real world, because there is no such thing like 100 % reflective or 100% vacuum.
 |
Other Makes Campagna V13 2012 Campagna V13R V Rod T Tex Motorcycle | US $20,100.00 | 15m |
 |
DeWalt DCK274L 18V Li Ion 1 2 Cordless Hammer Drill Impact Driver Kit | US $235.00 | 15m |
 |
NEW 2 Ruffled curtain Valances custom made white light blue JOYCESCURTAINS | US $19.99 | 15m |
 |
SR49945 SERPHANITE 925 STERLING SILVER RING JEWELRY s75 | US $7.99 | 15m |
 |
M AUDIO PROKEYS 88sx 88 KEY PORTABLE DIGITAL PIANO KEYBOARD USB AUDIO INTERFACE | US $277.69 | 15m |
 |
DEPO EURO RED LED TAIL LIGHTS BRAKE LAMPS 2000 2003 BMW E46 3 SERIES 2D COUPE M3 | US $125.00 | 15m |
 |
Nissan Maxima SE 2002 NISSAN MAXIMA SE FULLY LOADED 1 OWNER CLEAN RUNS GREAT | US $4,750.00 | 15m |
 |
LEGO CITY Corner 7641 Repair Truck 3179 Bike Shop Store Pizza Waiter Bus | US $76.00 | 15m |
 |
White Verizon Apple iPhone 4 MC677LL 16GB CDMA Smartphone 16 GB Phone | US $275.00 | 15m |
 |
Steripen Advernturer | US $44.00 | 15m |
 |
AUTHENTIC HERMES Gold Plated Green Leather Medor Cuff Bracelet | US $226.50 | 16m |
 |
Excellent Cond Schrade Cutlery USA XL t shirt short sleeve 2 sided graphics | US $4.25 | 16m |
 |
15 Unrooted Angelwing Begonia Cuttings | US $5.00 | 16m |
 |
Vintage Ohio Tool Company 7 Piece Socket Firmer Chisel Set | US $83.33 | 16m |
 |
Large Red Onyx Agate Druzy Slice Pendant Bead T11076 | US $4.25 | 16m |
 |
LOT 5 AIRSOFT GUNS RIFLE SHOTGUN PISTOL AIR SOFT BERETTA COLT SPRING W BBs | US $29.49 | 16m |
 |
Rhyolite Rainforest Jasper Pendant Bead G141237 | US $2.99 | 16m |
 |
Bad ESN Apple iPhone 4 8GB White Verizon Smartphone | US $203.50 | 16m |
 |
LENT A WILLIAMSON Tall Bearded Iris Historic 1918 | US $25.05 | 16m |
 |
Teeth Whitening Tooth Whitener Health Oral Care Toothpaste Whitening Gel Hot New | US $.99 | 16m |
 |
Kodak EASYSHARE Z1012 IS 101 MP Digital Camera Black | US $76.00 | 16m |
 |
Day Trip Sz L • Purple Smocked Semi Sheer Peasant Top Layering | US $10.55 | 17m |
 |
32GB New in Box White Apple IPhone 4S SPRINT Wifi Siri Clean ESN Trusted Seller | US $476.99 | 17m |
 |
TITLEIST 909DCOMP SUREFIT 105 DRIVER OZIK XCON 5 BY MATRIX GRAPHITE REGULAR | US $71.07 | 17m |
 |
NWT Valerie Stevens Intimates Cute Pink Pin Dot Cami Capri Pjs Sz M | US $.99 | 17m |
 |
Jeep Wrangler WE FINANCE 2010 JEEP WRANGLER UNLTD SPORT CONVERTIBLE 4X4 6SPD 42K | US $22,980.00 | 17m |
 |
RARE Natural Gem 121ct 85x65mm Oval MORGANITE Pink Emerald MADAGASCAR | US $2.51 | 17m |
 |
Suzuki Hayabusa GSXR1300 SUZUKI HAYABUSA GSXR 1300 Candy Red NO RESERVE | US $5,655.00 | 18m |
 |
WHITE THIN SLIM LIGHT HARD BACK CASE COVER FOR APPLE IPHONE 3G 3GS PROTECTER NEW | US $1.08 | 18m |
 |
1 pcs 3016 14mm Round Button Genuine SWAROVSKI ELEMENTS Crystal Beads JET | US $.91 | 18m |
 |
AUTHENTIC TIFFANY CO Elsa Peretti Sterling Silver S Chain Link Necklace | US $106.50 | 18m |
 |
Lot 7 ROALD DAHL Chapter Books Fantastic Fox Matilda BFG Twits Giraffe Finger | US $7.99 | 18m |
 |
Apple iPod touch 4th Generation 8GB Latest Model Broken AS IS | US $41.00 | 18m |
 |
Vintage early snapshot wet wader sexy girl hiked skirt CL 794 | US $3.99 | 18m |
 |
Craftsman C3 192 volt Cordless Impact Driver | US $37.50 | 18m |
 |
DAVID BAXTER Goodbye Dave LP 1970 REFLECTION 1st ANDWELLAS DREAM | US $58.15 | 18m |
 |
New LED Flashlight Ear Cleaner Earwax Remover Earpick Curette | US $1.04 | 18m |
 |
SR41790 LABRADORITE 925 STERLING SILVER RING JEWELRY s7 | US $7.99 | 18m |
 |
Rotating Leather Case Skin Multi Angle Cover F VIZIO Tablet 8 BROWN US Stock | US $14.99 | 18m |
 |
1993 $5 AMERICAN GOLD EAGLE 1 10 OZ Great Quality | US $179.99 | 18m |
 |
60X 100X Zoom Jewelers Microscope Pocket Magnifier Illuminated Loupe LED Light | US $.99 | 18m |
 |
Chevy 2003 2007 Silverado 2002 2006 Avalanche Smoke HeadlightsBumper Lights 4pc | US $65.00 | 18m |
 |
Natural Gem 126ct 8x6mm Oval TOP STUNNING Light Greenish Blue AQUAMARINE BRAZIL | US $3.00 | 19m |
 |
DC 5V 18V Twilight Sunset Switch Light Control Switch Day Work Night off | US $7.50 | 19m |
 |
SR40216 AMBER 925 STERLING SILVER RING JEWELRY s65 | US $7.99 | 19m |
 |
Kodak EASYSHARE C143 120 MP Digital Camera Silver | US $35.00 | 19m |
 |
Antique Baby w Cat in Chair Interior Glass Plate Negative Photo 7 | US $4.99 | 19m |
 |
CoverGirl Truconceal Concealer Shade 1 | US $1.04 | 19m |
 |
AUTHENTIC TIFFANY CO Elsa Peretti Sterling Silver Tear Drop Dangle Earrings | US $96.01 | 19m |
 |
BEGONIA CONVOLVULACEA Morningglory begonia | US $3.50 | 19m |
 |
Kodak EASYSHARE C613 60 MP Digital Camera Pearl white | US $26.00 | 19m |
 |
BEGONIA Curly Emma spiral | US $5.50 | 19m |
 |
COMPUTER P4 28GHz DESKTOP DELL 1G DDRII SUPER FAST ULTRA XP PRO SP3 $$$EBAY B | US $88.45 | 19m |
 |
AMAZING FACETED TOP chatoyant stone of BRIGHT RED TIGEREYE CAB | US $16.00 | 20m |
 |
Antique Boy Leaning on Wheel Glass Plate Negative Photo 8 | US $4.99 | 20m |
 |
HOGAN Beige Leather Logo Ivory Soles Lace Up Casual Fashion Sneakers Sz 37 7 | US $56.01 | 20m |
 |
Procol Harum Live with the Edmonton Symphony Orchestra | US $14.99 | 20m |
 |
CARDINAL Tall Bearded Iris REAL “Flapper” from the 20’s | US $7.49 | 20m |
 |
NWT TALBOTS PETITES $69 COMFORT STRETCH STONE COLOR CROPPED PANTS SIZE 10P | US $11.38 | 20m |
 |
GOLD ETCHED ENGRAVED GUITAR BASS NECK MOUNTING PLATE FSR Custom Shop | US $9.99 | 20m |
