Light from flashlight

by botev1912
Tags: flashlight, light
botev1912 is offline
Nov27-13, 04:28 PM
P: 6
Does the light ,if I turn on the ordinary flashlight source somewhere here on Earth,go into the space.
And Does if it become completely mixed with all other electromagnetic radiation there would be some fraction of all that radiation that is still "my light" and would be (even with odds 1/∞) there some miserable chance to be detected as a "some specific signature" ? :)
Phys.Org News Partner Physics news on
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
Drakkith is offline
Nov27-13, 04:45 PM
PF Gold
Drakkith's Avatar
P: 11,057
Yes, the light can go into space. But it won't be detected as a specific signal, as it's just plain old white light.
sophiecentaur is offline
Nov27-13, 05:44 PM
Sci Advisor
PF Gold
sophiecentaur's Avatar
P: 11,398
Any instrument that receives your particular light beam will have to cope with all the other signals from that general direction (there is a limit to the resolution of any such interment) plus the naturally occurring 'noise' in the receiver. Detecting your signal will depend upon the signal to (noise plus interference) ratio at the receiver - as in all forms of communication.
You could improve on the reception by flashing the lamp at a pre-arranged rate and then looking for that oscillation frequency at the receiver. This is a well known experimentaltechnique (synchronous detection) which improves detection of low level signals.

Register to reply

Related Discussions
If the solenoid covers the whole length of a shake flashlight, will it light up? Classical Physics 5
Radar Flashlight General Physics 0
light intensity of a flashlight? Introductory Physics Homework 9
bright flashlight the emits white light General Physics 4
Torch Flashlight Electrical Engineering 0