Overhauling laboratory experiments 2015

From Physlab.lums.edu.pk
Jump to: navigation, search


Overhauling laboratory experiments 2015

Advanced Lab

Several major refinements were made to almost all the advanced laboratory experiments, notably 2.3, 2.5, 2.6, 2.10, 2.11, 2.12, 2.14 and 2.15. This included simplifications to the apparatus, revision of manuals, automation of manually intensive tasks and improved opportunities for data analysis. We believe that these adaptations will improve the advanced lab considerably in the years to come.

Here are details of refinements achieved in the introductory laboratory.

Dynamics, Moment of Inertia, Torque and Rotational Friction (1.2)

  • A new method for calculating angular velocity was developed using “height” data acquired from a sonar sensor through a LabVIEW program taking a derivative of the position of the mass-hanger.
  • The smart-timer was reconfigured to enable the mode of measuring the angular acceleration through the associated super pulley.

Craters in sand (1.2 B)

  • A ball drop device was conceptualized and manufactured using the 3D printer, this allowed better control to the students to place and drop the ball bearings from varying heights.

Heat Transfer and Newton’s Law of Cooling (1.3)

  • Improvements to the temperature averaging scheme were performed, considerably simplifying the experiment.

Latent Heat of Vaporization of Liquid Nitrogen (1.7)

  • Data Acquisition was introduced using a digital mass balance connected to PC through a LabVIEW program to collect the data of decreasing mass of boiling nitrogen.
  • The acquired data signifies that the cause of mass loss is due to ambient temperature and in one point due to the heater as well.
  • The data was analyzed using MATLAB and in a typical experiment, the latent heat value of (198 ± 2) J/g was calculated.

Electromagnetic Induction and Working of Read-Write Operations in Magnetic Media (1.8)

  • The layout in the LabVIEW file was improved a little where position and size of induced EMF graph and associated flux graph was resized accordingly.
  • From a sample data, magnetization of the disk magnets was measured to be (2.88±1.17) x 107

Vibrations on a String and Resonance (1.9)

  • A jack has been introduced to the apparatus setting to allow students to adjust the height of speaker, as it allows controlling the oscillator’s alignment against the fixed end, this also helped improve the creation better visible standing waves.
  • The part of experiment where it was required to change the length of the string was removed owing to keep the experiment simple and short.

Measurement of Planck's constant using a light bulb (1.11)

  • Goodness of fit test were carried out for the four data sets in which we include the initial and final data points
  • We introduced the goodness of fit test.

Electron energy loss investigated through the Nobel prize winning Franck-Hertz experiment (1.13)

  • The experiment performed with a new methodology, based on an improved physical model.
  • The calculations were simplified removing dependencies on vapor pressure.
  • The manual was upgraded with addition of illustrated apparatus picture and layout enhancement.
Personal tools