My Crystals: Quartz

Quartz:

Quartz is the most abundant minerals on Earth. Like Most crystals it has the typical Silicon and Oxygen compound (SiO2). This one robust point I got from Amazon.uk. They are realtively cheap due to how common it is. You have quartz infused in glass, in granite, in watches and in many different gemstones. This is a 3-side sketch I made of the various sides and features on my quartz. The top part of the point is mostly transparent with many complicated cracks inside the thick crystal. It is 4inchs long. Most things I notice about Quartz points in the raw are that the base which is where the point is attached to the cluster of points is very opaque or translucent. In Quatz terms, it is milky at the base and as the point develops it gets clearer and clearer farther from the base till the tip off the point.

 This is the biggest side on the crystal. If you look very closely on the flat sides, or by reflecting light from the side into your eyes (which highlights the surface details) you see linear patterns and many interesting designs!! I think that is due to the layering while it was crystallizing.

 As I was saying you can see the gradient of clarity. You might notice the tip has many dents and is chipped off, well thats due to me dropping it constantly. Despite that its a hard rock, Moh 7 is not a joke :P

There are many things you can do with Quartz for fun. Try passing lasers through the crystal to see a multitude of interference patterns. Try putting it under UV or black light. Go wild with this stuff! You never know what might happen!
Its Great for one to have a good sized Quartz specimen in his collection as it is the basic crystal which is cheap and stunning at the same time!!
They come in many colours. Amethyst, Citrine are some gemstones which are actually impure Quartz. Agate is a slice of a Quartz geode too!

Mathematica Presentation 3: Harmonic Oscillator

Here is the link to it, hope you like it! :

https://www.dropbox.com/s/w3eckvxvsxbcz68/Eqp.mp4?dl=0

Mathematica Presentation 2: Airy functions

I couldnt upload it, so here is the dropboc link to it, enjoy!

https://www.dropbox.com/s/id01sazu29cs6y1/eqp222.mp4?dl=0

Mathematica Presentation 1: Gaussians and Hydrogen Orbitals

I couldnt upload the video, but here is the Dropbox link to it, enjoy!

https://www.dropbox.com/s/id01sazu29cs6y1/eqp222.mp4?dl=0

deBroglie Relations and the scale of Quantum Effects, light waves as particles (b)

ii. a microwave operates at roughly $2.5 GHz$ at a max power

of $7.5 *10^9 erg/s$

How many photons per second can it emit? What about a 

low-power laser ($10^4 erg/s$ at $532nm$)?

Ans:

1.First for the microwave, 

The energy of one such microwave photon is $E = h v$

where the frequency v is $2.5*10^9 Hz$

so:

$E = 6.63*10^{-27}*2.5*10^9$

$E = 1.657*10^{-17}erg$

This is the energy, we have the power in erg/s which is $7.5*10^9erg/s$, to find the number of photons emitted we need to divide the power by the energy:

$\text{number of photons }=\frac{P}{E}$

$\text{number of photons }=\frac{7.5*10^9}{1.657*10^{-17}}$

$\text{number of photons }= 4.5265*10^{26}$

2.Now for the Laser,

Since now except the frequency, we have the wavelength we can substitute the formula of frequency in our energy formula:

$E=h*(\frac{c}{\lambda})$

where the frequency v is $2.5*10^9 Hz$ 

so:

$E = 6.63*10^{-27}*2.5*10^9$

$E = 1.657*10^{-17}erg$

$E=6.63*10^{-27}*(\frac{299,792,458}{532*\frac{1}{1*10^{9}}})$

$E=3.73*10^{-12}erg$

Now divide it with power:

$\frac{1*10^4}{3.73*10^{-12}} = 2.7*10^{15}photons$

Quantum micrometer experiment, how to find the width of your hair

HI! Yesterday I did an experiment to find the width of my hair using my green laser. The method is to hit the laser beam on the hair, the light passing above the hair will be like going through a slit, and the light passing below the hair will be like going though a slit. So in other words it is a type of double slit experiment. By using the effect of wave-particle duality of a photon, and the pattern of interference, we can calculate the distance between the two slits, or in other words the width of my hair. 

This is the setup of my so called lousy apparatus :P. I have supported the laser on the bucket using a stack of 4 coins, to adjust the beam to hit the hair. the hair is supported by a wire, which I have bended here and there for support. The wall where the interference pattern forms is 6.72meters away from the hair. 

This was the bucket with the laser and hair on it. the light flare ahead is where the beam hits the hair.

A close up of the hair and the beam hitting it.

So this was the interference pattern produced 6.72 meters away from my hair. The number of these fringes is 18, you can only see 15 in this pic, there are three more to the right. you have to count till where you cant even see anything. The length from the center fringe to the 18th fringe is 0.87meters, note all these values down.

To do this calculation there are two formulas which I had.

they are formulas to find the distance between the two slits, which will be the width of my hair.

the formula is $d = \frac{n l \lambda}{x}$

and

$d=\frac{n*\lambda*\sqrt{x^2+l^2}}{x}$ which is the same as the upper formula, but it uses the distance from the hair to the outer edge of the interference pattern. Im going to use both to find more accurate results.

in these formulas:

$\lambda$ = wavelength of laser in meters.= $532*10^{-9}m$

$n$ = the number of fringes. = $18$

$l$ = distance from hair to wall = $6.72m$

$x$ = distance from center of pattern to farthest countable fringe = $0.87m$

plugging these in the first formula we get:

$d = \frac{n l \lambda}{x}$

$d = \frac{18*6.72*532*10^{-9}}{0.87}$

$d = 0.000074m$

so using this fromula I get 74microns.

Now plugging in in the second formula we get:

$d = \frac{n*\lambda*\sqrt{x^2+l^2}}{x}$

$d = \frac{18*532*10^{-9}*\sqrt{(0.87)^2+(6.72)^2}}{0.87}$

$d = 0.0000746$

so using this formula I get 74.6microns.

Now I will take the average of these values I get 74.3 microns!!

For more accuracy, the lasers intensity should be high, distance between the hair and wall should be long, and the wavelength of the laser should be low.

violet lasers are best!

deBroglie Relations and the Scale of Quantum Effects, Light waves as particles (a)

(a) Light Waves as Particles:
The Photoelectric effect suggests that light of frequency ν can be regarded as
consisting of photons of energy $E=h v$, where $h = 6.63*10^{-27}erg*s$

i. green light has a wavelength in the range of 532nm. What are the
energy and frequency of a photon of green light?

Ans:
First to find the frequency we can use the equation: $c=v \lambda$
putting in the values:
$299,792,458 = v*532$

$v = \frac{299,792,458}{532*\frac{1}{1*10^9}}$ mid calculation unit conversion from nm to m

$v =  5.45077*10^{14}Hz$

so the frequency is $545.077 THz$

Now we can use the above equation of $E=h v$ to find the energy of the photon
so:
$E = 6.63*10^{-27}*545.077*10^{14}$

$E = 3.614*10^{-10} erg$

AKA $36.14\text{ nano ergons}$