Flashing Light Prize 2018 - Sunscreen, UV, and neon-----make money online

today on Applied Science I'd like to

show you my entry for the 2018 flashing

light prize so first off you can see

we've got an arrow Lux neon light bulb

with the cool flowers and even green

leaves inside it and as it twirls around

you can see that it's turning on and off

of course because it's the flashing

light prize however if I take a clear

piece of plastic and put it between the

light source that's on the left and the

bulb you can see it doesn't flash

anymore so there's actually something

very trick going on with how I'm turning

the bulb on and off it's spinning around

and you might think well there might

just be a physical switch contact that's

doing it underneath but that's that's

not it it's actually the light so let's

back up so you can see how this is

working okay here's the whole setup on

the right we've got a DC power supply

that's running a gear motor that's

connected up underneath the light bulb

and then we've got a very accurate and

20 volt AC coming into the variac and

then a slightly lower voltage going to

the bulb and I've got the bulb mounted

in one of these fire starter rotary

outlet adapters and then we've got a

really strong ultraviolet light on the

other side that's used for looking at

gels in electrophoresis so it's actually

quite a lot of ultraviolet coming out

there and then the real trick how did I

get the bulb to turn on only half the

time I sprayed it with sunscreen so

sunscreen blocks ultraviolet light to

keep you from getting Sun tanned or

sunburned and it's also very effective

at keeping the ultraviolet from getting

into the bulb and causing it to burn the

reason that I need the variac is that

the voltage has to be almost high enough

to get the neon bulb burning but not

quite high enough to actually get it

started because we want the ultraviolet

light to be the thing that pushes it

over so the adjustment is really

sensitive if I turn it just a little bit

further this way there's not enough

voltage to get it burning even with the

ultraviolet light and if I turn it too

far the other way it's on all the time

of course because it works just like a

neon light bulb that you plug into the

wall it's able to self start so

basically I have to tune this thing in

until it's just at the point where it's

about to go but not quite enough and the

ultraviolet gets it rolling pretty small

adjustment I would say just a few

percent plus/minus

so the question is does it have to be

ultraviolet light and the answer is yes

this is actually a great demonstration

of the photoelectric effect which means

that each photon has a certain energy

associated with it and the lower energy

photons no matter how many of them you

have are not enough to produce an

electron when they hit the surface

inside there so just a few UV or

high-energy photons are enough to do it

but you can have you know essentially an

infinite number of red photons and it's

it's not going to work however there's a

pretty cool trick we can play if you've

got one of these four oh five blue laser

pointers what we can do is turn the

power turn the voltage back down so that

the thing is just about on but not quite

and then if you hit the flower with a

laser pointer the 405 nanometer light is

enough to get the little bit of the

photoelectric effect going and you can

kind of turn the bulb on one little part

at a time pretty cool the green leaves

have a I think a zinc sulphide coating

on them which gives them that green

color otherwise they'd be similarly

orange neon colored okay

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