Lab 15: Active Physics: Lasers *

Lab Partners: Austin, Parry

Purpose:

The purpose of this lab is to examine the concept and mechanics of laser through graphic simulation.

http://media.pearsoncmg.com/bc/aw_young_physics_11/pt2a/Media/AtomicPhysics/1803Laser/Main.html


Method

Figure : Answers to question 1 to 4.

Figure : Answers to question 5 and 6.

Figure : Simulation of stimulated emission.

 

Figure : Simulation of stimulated emission.

 

Figure : Simulation of spontaneous emission.

 

Figure : Simulation of stimulated emission.

Conclusion:

 This lab provide a simulated environment that allows a graphical understanding of the mechanics of laser. The simulation also explains the cycle of light emission through spontaneous and stimulated method.

Lab 14: Colar and Spectra *

Lab Partners: Austin, Parry

Purpose:

The purpose of this lab is to determine the wavelength of the emission spectrum from varies of unknown gas through diffraction grating. 

Method

Figure: Unknown Gas.

Figure: Distance of diffraction grating for gas.

Figure: Diffraction grating for gas.

Figure: Geometry of the diffraction grating.

Figure: Calculations for the wavelength of gas.

Figure: Wavelength of unknown gas

Conclusion

We have determined the identity of the unknown gas through analyzing its characterizing emission spectrum. And we found that unknown gas is helium. The wavelength calculated for helium is within 6 percent error for raw result and under the uncertainty range.

Lab 13: Light and Matter Waves

Purpose:

The purpose of this lab is to understand diffraction pattern through simulating electromagnetic waves. We will be performing this simulation via python language.

Method

Conclusion

The simulation of the diffraction pattern has provide a step by step visual representation that allows a more thorough understanding on the concept. We have examined the behavior of the propagation of electromagnetic waves through space during diffraction and the observe patter of the diffraction.

Lab 12: Active Physics: Relativity 8*

Lab Partner: Austin, Parry


Purpose:

In this lab we will examine the effect of time dilation and length contraction by deriving the relation of the time and distance between two different inertial frames.

This lab is performed through active physics.

Time Dilation: http://media.pearsoncmg.com/bc/aw_young_physics_11/pt2a/Media/ModernPhysics/1701RelOfTime/Main.html

Length Contraction: http://media.pearsoncmg.com/bc/aw_young_physics_11/pt2a/Media/ModernPhysics/1702RelOfLength/Main.html



 Method:

• Time Dilation:

Figure 1: Answers to question 1 and 2.

Figure 2: Answers to question 3 to 6.

• Length Contraction:

Figure 3: Answers to question 1 to 4.

Conclusion:

In this lab we have derived the concept of time dilation and length contraction through active physics. We observed the experimental reason for which Einstein's theory of relativity is established and understand the graphical representation of time dilation and length contraction through applet simulation.

Lab 11: CD Diffraction (12-04/10/2012) *

Lab Partner: Adhitya, Bryan 

Purpose:

In this experiment we will be determining the grating spacing of a CD disc by diffracting a laser beam. We will examine the calculated grating by comparing the determined value with the standard CD disc grating distance and determine the validity of the calculation and method.


Method and Calculation:

 

Figure 1: Experiment apparatus for laser diffraction 

Table 1: Theoretical Value for Lab Equipment

Wavelength of Laser (nm)

632.8

 

 Figure 2: Performing measurement from the diffraction plate to the observed pattern

Table 2: Measured Value

Distance from Diffraction Plating to the Observed Pattern (cm)	45.2 ± 0.05
Distance between diffraction maxima m = 0 to m = 1 (cm)	21.25 ± 1.25

Table 3: Calculation for Diffraction Grating

Angle between the diffraction maxima m = 0 and m = 1 (o)	25.18 ± 1.25*
Calculated Grating Spacing (nm)	1487.33 ± 20.8*

Table 4: Evaluation of Result

Theoretical Value of Diffraction Spacing (nm)	1600
Calculated Grating Spacing (nm)	1487.33 ± 158.8*
Percent Error (%)	7.04

Conclusion:

In this lab, we have determined the grating spacing for a standard CD disc by employing the concept of diffraction grating. We have obtained a result of 7.4 percent raw error and a zero percent error under the uncertainty. We argue that our calculation remain valid as the determined value of grating spacing is in the uncertainty range.