is light particle or waves??!!

yess that's a big question.. long long time ago scientist confused whether light is a particle or a wave.. soo by the end of the 18th centuries Thomas Young set out an experiment to proof that light is a wave..

the experiment is using a light as the source, the double slit and the screen for observe the fringes.

the light is shield around. the double slit is placed at least one meter from the source and the screen place several meters from the slit. the experiment was taken in dark room. there are 3 important factors:

1. the slits are millimeter in width
2. the slits are about a millimeter apart
3. the slits and the screen is about several a meter

this experiment was for conclude that light has waves properties. to proof the fact that light showed interferences effects to conclude light traveled as a wave. this is achieved in the experiment by passing a single beam of laser light through the two slits. a the light passes trough, it is diffracted so it spread to the screen.

• determining λ

there are equation to determine wavelength, λ.

λ=ax/D

where:
λ:wavelength
a:slit separation
x:fringe separation
D:slit to screen distance

this equation derived from:

there are 2 ray made triangle (S1CX and S2CX). using phytagoras to write the expression:

S₁C² = S₁X² + CX² = D² + (x + a/2)²

S₂C² = S₂Y² + CY² = D² – (x – a/2)²

Subtracting it

S₁C² - S₂C² = (x + a/2)² - (x – a/2)²

We can write it like this:

(S₁C + S₂C)(S₁C – S₂C) = (x + a/2 + x – a/2)(x + a/2 – x + a/2) = 2ax

Now both equation very similar in length, so we can write like this:

S₁C + S₂C = 2D

This differences equal to one wavelength, λ:

S₁C - S₂C = λ

Substituting gives:

2D λ = 2ax

Then à λ = ax/D

this is the video about two slits experiment

http://www.youtube.com/watch?v=FeCV27-mk0I&feature=related

this is it about what is a light.. hope you understand it.

Thanks

another PHYSICS post :)

now i write about physics (again) and tadaaa it'is about WAVE. you all must be know about wave, yeah it'is in everywhere ocean,water,radio,phone signal,x-ray, even microwaves in your house is using wave properties.. but now i'll explain about waves in phsics way ehehehe..

soooo wave is a transfer of energy from one point to another via a traveling disturbance. and characteristics of waves is has wavelength, frequency, period, and amplitude.

there are 2 types of wave transversal and longitudinal wave.

transversal waves : Waves that travel perpendicular to the direction of motion. (ex: light)

longitudinal waves : Waves that travel parallel to the direction of motion. Made up of compression and rarefactions. (ex: sound waves)

Traveling Waves move through space at a certain speed

and for more information you can download it here, here, and here

sooooo enjoy learning about waves. hope it'll increase you knowledge in physics..
see youu.. :)

this is it (HAHA) my HSW presentation

okee. i present you about how electricity meter works

electricity meter is a machine that every house in this earth have(mostly) they calculate how much power every costumer use and the calculation is for the company to make the bill, so it's basically a machine that will calculate the power we use every month (usuallny)

thins thing works because of there are 2 coils inside it and if the electricity go through it it'll make the aluminium disk inside it rotate..and the number of revolutions the disk is proportional to the energy used. inside the machine is several gear that which drives the register (register:series of dials that record the amount of energy used)

sooooo that was the main point of my presentation.. you'll understand if you read my presentation so download it in here


this is the sneek peek



download it and enjoy it.
hope it'll increase you knowledge :D

see you

How Stuff Works

this is my physics project to present about how stuff works.. and after trough all the those crap i've done it about two weeeks ago hehe. and i presented about how kilo-watt hour meter work (actually i dont really know why i choose this heheh :p).. so i'll post about my ppt later okeeee
see you

......

actually these days im kind of busy but something makes me have to start open my blogspot (again) and i hope this makes me more increase my knowledge hihihihihi :p